Oh, I do agree that it's tedious, especially when it's tabletop instead of a video game.

My point is pretty much that I want consistency - if you (the game) don't care about adventurers who are very short, it doesn't make sense to care about adventurers who are very fat. Though I think it's pretty clear that the main issue for the BG3 devs was that animating fat characters is a lot of extra work that most players won't appreciate.

and have you ever been camping for more than a week without modern gear or tasted hard tack+pemmican?

Have you ever tried losing a lot of weight? Takes a pretty long time, even if you basically don't eat anything. The main character in BG3 basically springs into existence at the beginning of the game (with a very good excuse for why someone who never did any adventuring is suddenly on the road), and the game takes places over a couple of weeks or a few months, depending on how often you rest.