See, I guess the problem is one of perspective.
What I'm hearing a lot in opposition to my stance is 'it wasn't like this in 2e, and therefore would ruin the flavor'.
The only real alternative I have to that is 'screw 2e,' honestly.

Just because there wasn't sorcerers in 2e doesn't mean they shouldn't be a part of Dark Sun 3e, since the ARE part of 3e, as much as Barbarians and BAB.
And I certainly would've preferred it if the DS team, I guess, would've taken a more 'how can we translate the 3e rules and give them a Dark Sun flavor' approach, and less of a 'let's take 2e rules and update them' approach.
I've seen several examples in this thread alone of why having a Sorcerer in the Dark Sun world wouldn't have to destroy the flavor, if spun right. Thus, it makes everyone happy -- the flavor is presevered, and my player is happy to play a sorcerer that fits the setting. Instead of me saying 'try somethin' else, jonesy!,' I can say 'here's how you'll be different.' There should be more of that, and less of the 'Don't use these, they're stupid for Athas.'
There's no reason sorcerers can't fit into the preserving/defiling schema. And there's no reason that DS has to be 'low magic' (just replacing most magic with psionics to keep it at the same 3e base level). Other than, of course, 'because it wasn't that way in 2e.'
Similarly, Bards....you could, for instance, say that bardic magic is 'psychically defiling', withering free will as normal magic withers the plants. There's pretty much the only mechanical change needed...apply it to both their spells and their songs, and you're good. All the rest is 'bards on Athas don't prance around and sing in taverns for ceramic...their darker and stealthier and their knowledge comes from the seedy deals, isntead of the limelight. This is, in part, because Bards use arcane magic, and thus join in the defiling tradition. It is also because Bards are much more stubtle in this defiling, and must take pains to make sure that those who may know them are unaware of their mental decay-causing abilities.'
Is that, for any reason other than 'they didn't do that in 2e', somehow world-shaking? An arcane caster who defiles minds as a normal wizard (or, potentially, sorcerer) defiles the land around them?
I guess in other words, I had hoped the disign team would focus more on OPTIONS and less on restrictions. More on how to make a third edition of Dark Sun, and less on how to make a rules update to the second edition of dark sun.
Meh. Since 3e doesn't have to affect flavor at all, I would've hoped for a more 'robust' translation...one that didn't forego much of 3e potential due to some misguided (I feel) attempt at preserving cannon.
I mean, take the Planescape 3e conversion, for a ferinstance. They're doing factions powers as FEATS. They're using Tieflings with a Cha penalty. They're using Bariaur with level adjustments. None of these is particularly true to the 2e version, and will drastically change some elements of the game (especially the importance of faction membership on a PC). Sorcerers and barbarians and monks have now always existed in the setting. They're taking, from what I can see, 3e, and slapping the Planescape flavor all over it. Which results in a setting that I can play with any concept I may have, and proper for the setting (Bilbo wouldn't exactly survive long in Sigil, either...though I guess Bilbo wouldn't survive in 3e period...). They could've just said 'Factions are templates,' 'Use our races instead of the usual ones,' and 'Sorcerers don't exist,'....but they embraced 3e.
I guess when I see a Sorcerer, and I see Athas, and I put the two together in my head, I say 'why not?', whereas the disign team said 'why bother?' and left it at that. And you can see that the setting certainly benefits from the inclusion of a properly spun sorcerer....self-defiling, defiling as normal (but training to not use spell books), or having a Sorcerer-King in their lineage....why can't any of these be a part of the official DS campaign setting? And I'll need something better than '2e didn't have 'em,' to satisfy me....because 2e didn't have Barbarians either, but Dark Sun has obviously always had them.
And Preserving/Defiling? You don't even need a new class for that. Just specify that arcane spells always do certain damage to the wielder (maybe subdual to a preserver, maybe real hp damage), or to the area around (a certain foot-radius per point of damage). No need to have two completely seperate classes or even one new class....