Aren't the rules pretty clear on this? Neither Splinterbolt nor Orb of X nor Fireball operate in an Antimagic Field.
The reasoning seems fine, if you're comfortable putting a lot of weight on the fluff of spell descriptions. I'd worry that it'd lead to kind of annoying arbitrary argments, though.
Let's compare Splinterbolt and Orb of Acid. You could, I think, argue that Splinterbolt creates a piece of wood and then hurls it. Both of those operations are magical: wood doesn't ordinarily spring into being or throw itself at great speeds. But, after it's cast, it's just a pointy thing moving at high speeds. So, it's like something launched with a Telekinesis spell.
All that seems fine. But, Orb of Acid. If you want to think it through the same way, wouldn't the Orb dissipate and splatter once it hit the Antimagic Field? I mean, acid does not normally keep itself coiled into tight easily thrown balls.
Creation: A creation spell manipulates matter to create an object or creature in the place the spellcaster designates (subject to the limits noted above). If the spell has a duration other than instantaneous, magic holds the creation together, and when the spell ends, the conjured creature or object vanishes without a trace. If the spell has an instantaneous duration, the created object or creature is merely assembled through magic. It lasts indefinitely and does not depend on magic for its existence.
Emphasis mine.
Orb spells can be cast into an Anti-magic field just fine, so long as the origin lies outside of the field. The only magic involved is at the origin, where the ball of acid/cold/fire/force/whatever is assembled, after that you're tossing a literal ball of element at something. It's a real, physical object - not magic.
It's also pretty stupid in my opinion, but it is what it is.
As to the question at hand: Wind Wall is a jerk like that. You have to decide what "normal" means. At my table, anything which involves magic is no longer "normal" - I'd let Conjuration (Creation) through a Wind Wall, as well as +1 arrows or arrows fired from a +1 bow.