SorO, the requirement to be able to do one thing does not preclude you from being able to do another thing. Being able to cast spells without preparation is not an exclusive requirement. It asks only "can you cast spells without preparing them in a slot first?"
Not "Can you
only cast spells without preparing them in a slot first"
Same for Versatile spellcaster "Ablility to cast spontaneous spells." =/= "Ability to
only cast spontaneous spells." If you meet the second version, good for you, but the first version is non-exclusionary, and is met by being able to cast spells spontaneously.
The section on spontaneous casting on RC 139 says that spontaneous casters cast any spell they know from spell slots without preparing the spell that they are going to cast spontaneously first. They also don't prepare or cast these spells from spellbooks. They take a full-round action to cast the spells with metamagic. They learn these spells either by selecting them when they level up, or they have a list of them they gain access to when they level up.
The last section, regarding other spontaneous casting says that the spells cast spontaneously by prepared casters in place if a prepared spell follow special rules for spontaneous casting, but otherwise function as normal casting.
So, a Spontaneous Divination Wizard knows all divination spells of a spell level he can prepare spells, he need not even pay to put the divination spells in his spellbook. He casts them spontaneously other spells already prepared. He casts them without referring to a spellbook. He learns his entire list of divinations for any level he can cast when he gains an appropriate level. These are all special rules for spontaneous casting. Otherwise this spontaneous casting functions as normal spellcasting.
A good cleric casts cure spells spontaneously by replacing spells of equal or higher level already prepared into slots. He knows these spells when his level in his class is high enough to gain access to the level these spells are on...etc.
Spontaneous spellcaster does not mean
unable to cast spells
with preparation, it means
able to cast spells
without preparation.
Link's statement was a Sorcerer with Arcane Preparation is a Prepared Spellcaster and per the RC a Prepared Spellcaster cannot cast anything that's not Prepared.
No that's not what Linklord wrote, not even a paraphrase. Linklord wrote that a Sorcerer with the Arcane Preparation feat gained the ability to prepare spells, and thus failed your definition of spontaneous spellcaster, which definition he apparently agreed with. That meant that he no longer qualified as a spontaneous spellcaster,
not that he became unable to cast spontaneous spells.
Functionally, what's on the table is the interpretation of how things cross over. Chemus thinks a Wizard with Spontaneous Divination, or form the other side Sorcerer with Arcane Preparation, mechanically becomes the other which runs into a lot of errors. It disagrees with rule entries that can only be worked out by overlooking or ignoring them and you have to get pretty subjective with terms that consistently don't as a houserule patch to ad hoc things into a working, a bit broken, condition. All for the end goal of being broken, >.>
Your initial sentence about my thinking is correct. Spont Div Wiz, Sig Spell Wis, Arcane Prep Sorc, Cleric, Druid, all cast spontaneous and prepared spells. They're all prepared and spontaneous spellcasters. Mechanically, this breaks... what? Disagrees with which entries, and in what way? What has to be houseruled?
Ex.: here's part of the spell 'Symbol of Spell Loss, SC 218: "...[a saving throw] Failure means that the highest-level spell prepared by the [targeted] spellcaster (or highest-level spell slot, if the character casts spells spontaneously) is lost for the day..."
The character who has a highest level prepared spell in his highest slot who also casts spontaneously loses... that highest level prepared spell, which is also the slot that he could cast his highest level spontaneous spell from. Where's the subjectivity or houserule? Ooh yeh, the DM would have to agonize whether to kill the highest level prepared spell or the highest level slot of the AP Sorc. That's... uh, really nebulous...
Is a Spontaneous Divination wizard using
Versatile
Spellcaster to cast spells he knows of a level higher than those of his peers overpowered or broken? Yes. It's akin to Gnome illusionist/Shadowcraft Mage casting an Earth-Invisible-Cooperative-Sanctum-Heighten Silent Image Cantrip from a 5th level slot and getting a 7th level conjuration (creation/summoning) spell at 100% reality, and +8 to his caster level. Or a 9th level and 120% real (on a failed save) while in his sanctum.
But it's not against the rules. If you don't like it, fix it in your game. Being a dog in the manger, trying to tell people that wizards can't ever ever ever cast spontaneously, is disingenuous.
The other side of the argument which is held by me points out there is a difference between having the mechanical rule defined abilities and having something that produces the end result, in other words it's impossible for a Wizard to count as a Spontaneous Caster when it comes to the rules even if they are producing a similar result that follows some of the rules in question.
How? There are rules in place that specifically call spontaneous replacement of prepared spells spontaneous casting, that say that it follows special rules for spontaneous casting, and that include spontaneous conversion users under the title of spontaneous spellcasters.
...In fact, you may know this argument under it's other name. Precarious [sic] Apprentice. It's the Feat that gives you something people would normally call the ability to cast a 2nd level Spell but the Feat goes on to say that when you do obtain the ability to cast 2nd level Spells it loses some of it's functionality.
Precocious Apprentice says "...Until your level is high enough to allow you to cast 2nd-level spells, you must succeed on a DC 8 caster level check to successfully cast this spell; if you fail, the spell is miscast to no effect...When you become able to cast 2nd level spells..."
Spontaneous Divination says "You can spontaneously cast any spell of the divination school by sacrificing a prepared spell of equal or greater level. [example]" (this is the entirety of the benefit section, minus the, apparently correct, example, as examples are to be given little weight anyway.)
The one qualifies that you can't cast 2nd level spells until your level is high enough, then goes on to say what happens when your level gets high enough, the other straight up says that you can spontaneously cast div spells by sacrificing prepared spells, without qualifying anything. Not the same argument at all.
So yes, it's a strawman (I never said boo re: PA)/red herring/association fallacy.
Heck you can hark back to the sixteen year old debate of if Grease is flammable or not since it's all the same deal.
Yeah, that's really good. An interpretation of the physical properties of grease, versus specific words and even rules that show that they mean what they say.