There's no must.... but world generation must be done by the GM?
Not what I said. Did you overlook the part where I overtly characterized that as a generalization, and then flat-out acknowledged that the GM should talk to the players first?
The setting isn't set in stone. Nothing is being overturned. It's being developed.
Eventually the setting does have to be given the impression of immutability, at least where certain considerations are concerned. Otherwise there's no sense of continuity to anything, and the point of having a campaign becomes much harder to maintain (again, in my experience).
I don't know... I think Elliot is a character everyone remembers, and clearly the main character of E.T.
Who's the movie named after, again?
I didn't say that there was a 5e background that indicated you were the last mage in the world. I said there are 5e backgrounds that grant renown or reputation that would be greater than that of other PCs.
Which just goes to show that you don't need to overturn setting convention if that's what you want for your character.
I generally think of PCs as both main characters and supporting characters. The focus shifts pretty significantly at times.
When one character has it written into their backstory that they and they alone overturn what everyone else believes to be impossible, I suspect the spotlight will shift back toward them more often than not.
I mean... that sounds pretty passive.
No it doesn't. It's avoiding working twice as hard for half the reward.
I mean, any campaign has a risk of being repetitive. This doesn't seem to be something unique to this premise.
No, but it lends itself quite easily to that problem. Is that worth the reward? The player of the PC in question might think so, but as for the rest of the group, I'm less sure.
I don't know. I think when so much of the game is up to the GM, it's not very surprising when the players get possessive of their one source of input into the game.
The players have a great deal of input into the game, insofar as what their characters
do. It's why there are so many stories about GMs trying to deal with sudden curveballs from the PCs' actions, especially when they've gained more power over time. To suggest that they're somehow hamstrung if they can't start out as being able to redefine the world itself strikes me as overblown.
If you consider me applying your logic in a slightly different way is me making a caricature... well, I don't know what to tell you.
If I thought that's what you were doing, I wouldn't have called it a caricature. But simply restating someone else's point by inverting two parts of it with no further commentary doesn't really suggest anything, except being pointlessly contrarian.