I think it’s mostly because of this: https://evseekers.com/why-do-tesla-windows-go-down-when-opening-door/ (Looks like AI slop but it does explain what I think it’s needed for)

Many modern car doors do not have a frame around the top of the window. So to not damage the window or seal in the door frame, they temporary lower it a bit using electricity. I’m sure Tesla would be incompetent enough to make it so there’s no decent way to do it without this feature.