Suppose someone assert this - what does it have to do with GMs being "power hungry and abusive"? Nothing at all!
Which was my point: you asserted that various posters described GMs as power hungry and abusive, but in fact NONE did.
If you can't think of any reason why someone would think a roster is a good bit of game design, other than that they think GMs are power hungry and abusive, well that's on you.
I think different things work for different games. Whether that be points, a roster, hard and soft moves or whatever. That doesn't mean they're universally good or that my game would be better because of it which is something people have pushed. I simply disagree.
If you can't understand why having constrictions on the GM that the players know about can be detrimental to the enjoyment of the game for some people, that's on you.