Remathilis
Legend
I think theme-wise, most people seem to agree that the setting should harken back to the original 90s publication; some people do seem to like how Dark Sun worked in 4E, but I think people who want DS to have "all the classes and races of 5E" are a minority here. Yes there should be thematic ways and adventure options to run "D&D hard-mode" but this also doesn't need to be the default.
Awww... we were having a nice agreement on how draconic sorcerers could work in the setting and you had come and ruin it!
Here's the thing: in third edition there were updates of Dragonlance (WotC/Weiss) and Ravenloft (Arthaus). There was even a Dark Sun update in Dragon (Paizo). You know what they all had in common? THEY MANAGED TO FIT ALL THE PHB CLASSES AT THE TIME IN THE SETTING! Sure, they made some exceptions for race, (removing a few, adding or replacing some) but both of those settings (which like DS banned classes in 2e for "flavor" reasons) managed to find them all homes in 3e. And guess what? Nobody says how RL or DL was destroyed by allowing monks, paladins, or sorcerers in them.
Crunch-wise, I think we do need to recognize some classes, like clerics and paladins, just don't work here. Some races even-more so; there are no gnomes, and although there were options for tieflings here in 4E they really don't fit the minimalist theme here. However, making clear that some races don't fit a setting is not unprecedented; the recent book for Theros has only this to say on the base PHB races;
A diverse assortment of peoples dwell among the lands of Theros. Aside from humans, the races in the Player's Handbook are unknown on Theros, unless they're visiting from other worlds.
No, no we don't. D&D is not the same game it was in 2e. Settings, tastes, and attitudes change. Dark Sun's edgelord "I'm not your father's D&D" isn't going to work under a climate where books are greenlit on the basis of % of players willing to buy-in. You are NOT going to get sufficient buy-in for a setting that renders most of the PHB obsolete. And the Theros line is disingenuous when it comes to Dark Sun; its isolated from the multiverse so those "other worlds" are cut off. You might as well re-write it:
A diverse assortment of peoples dwell among the lands of Athas. Only the options presented in this book exist, unless your Dungeon Master decides otherwise.
A single sentence makes clear that the standards of normal D&D races do not apply. It is not difficult to imagine a similar line (or a page or two) being used to explain how some classes either don't exist or require moderation for use in Dark Sun. The book will certainly provide a suite of new subclasses for use in Dark Sun so people can play as most of the classes, and even the spellcaster classes will largely work with a Dark Sun approved spell list (Preserver/Defiler does not require it's own subclass, just rules explaining how spellcasting creates a cost on the player or environment).
So at this point, we circle back to "what classes make the cut?" If we are going most conservative (replicating 2e box set to a fault, keeping 'hard mode" status) you need to remove: Barbarian (AC, DR), Bard (magical), Cleric (divine), Monk (AC, martial arts), Paladin (divine), Sorcerer (magical), and Warlock (magical/planar). You also need to ban EK, AT, and any other subclass that grants arcane magic. And that's just from the PHB; presumably, NOTHING from Xanathar's Guide will work except maybe(?) a subclass like Mastermind.
Now, let me let you in on a little secret: people don't like being told they can't play with thier toys. That most of the PHB is banned and nearly all supplemental books they bought are equally deadweight. This is especially going to be true if you don't include viable alternatives to replace them. You can usually get away with races because those don't define a character in the same way class does. But banning up to seven PHB classes and dozens of subclasses and I maybe get 4-5 new subs to play with? Uh, no thanks.
Obviously magic will need some modification to account for how defiling/preserving works, but I also don't think it requires that much modification if there is also a page of "Dark Sun approved spells" (listing the spells from other books that are usable in Dark Sun, and new ones specifically designed for the setting). Psionics will make an appearance of some kind, either as its own class or as subclasses (probably the latter based on UA, but it hardly matters).
Lather rinse repeat with spells (5e has been slow to add new spells, so every banned spell is a further reduction of PC choice), backgrounds, equipment etc. If your 1-2 pages is a pure "this doesn't exist" you're going to make new players go "then what does?"
TLDR: You're making a false choice between either a minor 4E book or a completely new game system, when it is not required to make Dark Sun both functional and true to the original's themes in style and gameplay.
You're making a choice between a faithful recreation of a setting that was a minor hit 20 years ago and one that could actually sell in 2020. There is no way WotC is putting out a setting that is barely compatible with its own PHB! Either the setting gets brought up to support 5e, or it needs to find a way to exist without referencing a book that's mostly obsolete to it.
Or it needs to stay in limbo if its that incompatible to the game today. It can go chill with OA in the "good idea for its time" section.
And oddly, no discussion ever why some one can not play his half-tiefling-half hobbit in Theros. Zilch. Nada.
Nice strawman. People are discussing the game supporting at bare minimum what 4e supported.
"Why do you complain on classic Darksun restrictions and keep quiet about Theros? Please do also answer, if you do not intend to play either of those settings."
See above. Theros still allows me the choice of any class in the PHB, plus any background and all the spells. Dark Sun is going to tell me what races, classes, backgrounds, spells, and equipment my PC can have. It might as well pre-gen my character for me at that point.