You're preaching to the choir, but in trying to read the room that's what people here seem to be saying and upvoting the most often. I do keep in mind that we--Soapbox--are a large but not majority population of the Mu* world right now, Soapbox is our audience for this discussion.
That's not to say that I don't think there are ways to make it happen:
- Staff must be clear as to the intent of the game.
- All of their actions should support that intent. (Within reason; even rational humans can create toxic situations.)
It helps if you already have a circle of people to start the game; people who will support the game culture so you don't have to build it from scratch.
But yes, it comes down to "I want to enjoy my time on this game", which is unhelpful but is also a truism. What you enjoy will dictate what kind of game you want to play, but there are not infinite choices and so threads like this one are put forth to get the temperature of the room.
Someone doesn't want to spend time making a character for a game that will have little chance integrating with the game might ask, "What character types are needed?" (Or check a census, or whatever.) This isn't usually to follow what's dictated, but to get a feel for things.
If you're going to spend a lot of time making a game for people you don't know, you're going to want to know what kind of things they want to play as a part of deciding if you want to put in the effort.
Because our time is also much more finite since we were kids. And so I'm going to rate "staff who maintain the game culture" as critical. Even if that culture is "steel-fisted wacky-ass".