There is some sort of a global "player id" that identifies you to Minecraft servers. This id has a 1:1 relationship with a game state on a server. Is it possible to get a new game on a server without getting a new id (without buying a new copy of Minecraft)? This would make it possible to start from fresh on a server one doesn't control.
I think that the whole idea of there being a single game state associated with a single user id is, on its face, absurd. When you play locally, you can have as many games as you wish. The same should be possible on a server. I have no problem with having a unique id so that someone can ban me etc. I just wish there was a way to have more than one game state (player state) on a server, so that I could explore different strategies etc.
My question is not about impersonating another player, nor avoiding bans, etc. I simply wonder why online play limits the functionality present in the basic local Minecraft - namely that you can have more than one game state.