"This attitude" is coming from a near perma-DM. So I'm being selfish because I want to engage the players in the world and let them play what they want? How does this work?
And yet by treating players like adults and empowering them I've found that
consistently when they have picked something I hadn't forseen it has been because, like the Tiefling example in a religious campaign, they've found a way of enhancing the themes I'd set up. Meanwhile every single time I've seen a DM try to keep a tight grip on things like races they've been precious about the rest of the setting leading to a much less fun campaign. I even used to do this myself when I started DMing.
Meanwhile I have learned from experience that players, good and bad alike will look at what you point at as DM.
- When you explicitly restrict races that is the strongest signal you're sending. And will immediately draw attention.
- When you don't the strongest signal you send is the pitch, so everyone is going to try to create characters based on the pitch
- Players who are used to over-controlling DMs who are allowed to go wild will for the first character after. But this lasts one character
Which means I ban basically two types of characters. Brooding loners who don't want to join with others, and characters brought in from other campaigns. And this works at an open table for all levels of experience.
When/what/how are they doing this? Like I've said I've almost never seen a player pitch something that wasn't inspired by what I laid out for them. But a ban list is an attention grabbing part of the pitch. (Incidently telling people what not to do is considered bad teaching for the same reason). Meanwhile the people that don't fit are both good adventurer fodder and working out what happens to them adds depth to the worldbuilding.
You mean you
don't work characters into the game world?
So apparently now the players
didn't actually accept the "rules of the game world". They are chafing at them. It sounds as if you're having to use a lot of brute force for your pitch.
My view is this; as a DM, making a request that people don't do things is rude and treating them like children. It both speaks to poor DM skills and an unwillingless to allow player agency. And I say this
as a near-perma DM.