wouldn't that state information also have to be on a server with costs? I'm sure you know what you're doing, but it is very cool that y'all talk with us players about this stuff. a lot of game companies want to be opaque about their internal functions which probably makes sense for optics, but this way is joyful.
I'd assume in an ideal situation, the information the server keeps for an active player in a zone would be as small as possible and would closely match the amount of information in the "state information". while you may want to make it so the zone the player left is inactive, players probably expect it to keep living: monsters move and regen etc during this time. on the other hand, this is such an unimportant issue: this game is quite fun the way it is and I don't mind going through enemies again if I tp. if I didn't like going through enemies, I wouldn't play this game!