It is what I have been told by an actual user on this forum. I don't want to name names, particularly when the poster in question clearly has chosen not to participate here. But I assure you it is a specific person. I can DM you the name if you care enough to know it, but I would request that you not invoke it here, again just to respect their space.
I'm pretty sure you've been in the thread when this person has specified just how much they know about their world. They know every continent, every city on those continents, and most (if not all) factions. They know so much information, it's simply impossible for there to be a location in the world they haven't already described in their notes, or so they claim.
That person was wrong.
Except the level of detail is the reason why the "theme/premise" can't fit it.
And now you are wrong. Theme/premise isn't based on the level of detail. Dark Sun has a tight theme/premise, but with far less detail than the Forgotten Realms, which has a very broad and vague theme/premise. You can dump entire new races all over the Realms without it registering a blip, but even a single member of some races will disrupt Dark Sun.
Because there literally isn't a campaign theme or premise which is so utterly incompatible with turtle-people that it cannot possibly be done. I'm quite happy to be proven wrong if you can give me, say, two themes/premises that are not literally "Just No Turtles", where it would genuinely be utterly incompatible. "Sword and sorcery" ain't gonna cut it, sorry--because "sword and sorcery" is gonna include a bunch of other Weird Stuff, so the forbidding is still completely on the GM, not because "Sword and Sorcery" actually has any problem with turtle-people or whatever. (As if it were any less problematic to have elves or dwarves!) Dark Sun is "sword and sorcery" and it accommodates all sorts of things just fine. E.g. the dray, which allowed seamless integration of dragonborn into a classic setting!
It's not whether it CAN be done, but rather if it's going to be a disruption if it IS done. I can take Dragonlance and get rid of Draconians, replacing them with Dragon Tortles if I want. It would be a huge disruption to what Dragonlance is, though.
"Can't possibly be done" is a standard that fails on its face. Some settings like the Realms can accept pretty much any race without issue. Others like Dark Sun can't.
But that's precisely what's being said. Player fun inherently, necessarily, takes a back seat to GM fun. If the GM's worldbuilding fun is impinged upon, to even the slightest degree, it is an unacceptable destruction--so the player's fun must be impinged upon to protect every single part of the GM's worldbuilding fun. If sacrifices must occur, only the player(s) must make those sacrifices.
No that's not "being said." Maybe one or two people have said that, I don't know because I missed half the thread. The rest of us are saying we will try and compromise, but if that compromise isn't acceptable, then the answer will have to be no, because full tortle, regardless of how it got there, is a disruption to the setting.
That's not what I would call leadership. In fact, I would call it behavior blatantly unbecoming of anyone GMing or wanting to GM.
And it's unbecoming for any player to want to play a race that isn't on the curated list. That's the player saying "Screw you. Your setting and game don't matter to me. I'm going to disrupt your game if I want to." to the DM and all of the other players who didn't do that. That sort of attitude is a huge red flag that the player is going to be a disruption in a lot of other areas of the game, because of his or her self-centered nature.
The only time there should be a situation where a player comes to the table with a race or class that has been curated out is if somehow the player wasn't aware of the restriction before session 1. Prior to that, it should be no more than a possibility if the player finds out at session 0, or shouldn't happen at all if the player found out during the pitch.
Again, I don't expect leaders to simply suffer all the time etc., they deserve to be happy too. But if someone has to make a sacrifice for the good of the group? I expect the GM to take the lead on doing that. I encourage the players--including myself!--to take one for the team now and then too, as that's one way of showing respect for their GM's leadership.
No. Nobody has to take the lead and it's wrong to expect the DM to do so. Nor is allowing a disruptive race into the setting good for the group. It's only good for the selfish player expecting it to be done. It's a disruption to literally everyone else who accepted the setting theme/premise like folks entering a social game do.
The DM should try to compromise where possible IF the player legitately didn't know about the curation before session 1. It's iffy at session 0, but could happen. After session 0, the player is being a disruptive jerk if he insists/expects to get his way and be allowed to play a curated race. It's not at all hard to make a fun and exciting member of the race
the player agreed to play when he joined the game.