that's necessary tho, that's the entire point of AppData existing. Documents can make sense for certain software (like a DAW storing projects or samples there by default, for example). But programs generally shouldn't act portable if they aren't

There's nothing wrong with offering the option, I suppose, but using separate locations for user data is the sane default, especially for systemwide installed programs. Even non-installed programs defaulting to using AppData (or .local for Linux) is nice. Portable should be an explicit choice.