Where did I say that RAI is only limited to player interpretation?
When you tried to exclude including the FAQ as a source.
That is true... and none of those would be RAW. RAW would only be the actual texts and any official errata. The fact that RAI can come from any number of different sources is in no way a contradiction of what I said.
Well . . . no.
They
are the rules as written, just presented in a different, clearer, way.
Well, theoretically at least.
That people didn't "understand" the original text does not automatically mean that the original text does not mean precisely what the later clarification says it meants.
Again, this in no way contradicts what I originally said. I never said that RAW was always in agreement with itself. All I said is that if RAW and RAI aren't in agreement, then that makes RAI a houserule, by definition. You haven't refuted that. You've just said that RAI can come from a number of places and that RAW isn't always non-contradictory.
And that's the problem.
IF RAI is what the RAW should have been so everyone could have clearly understood it the first time, THEN it isn't really RAI at all, but RAW.
IF RAI isn't, but is instead some kludge because someone polled didn't actually like the original rule and decided to just make something up on his own, THEN it isn't actually RAI at all, but purely a houserule.
The problem in that case is that what people call RAI is really a conglomeration of "What I Think Is The RAI" (WITITRAI), "What The Writer/Editor Said Is The Rule As Intended" (WTW/ESAITRAI), and "What Someone Else Wants The Rule To Be So He Can Get Over" (WSEWTRTBSHCGO).
This is true. I already noted that we all play houseruled D&D in some way or another.
That ultimately means declaring what someone else presents is "just" RAI is really trying to reduce it to WSEWTRTBSHCGO, while reserving the houserules you present as WITITRAI, even if that means tossing WTW/ESAITRAI, and even RAW itself, out in the process.
That such declarations have no factual value themselves in resolving a disagreement means that even bringing it up is pretty much a fallacy in and of itself, and thus of no worth to the topic at hand.