Why don't wireless speakers support balance?

dandv

I've been testing three wireless speakers so far (Oppo Sonica, Phorus PS5, and Wren V5US) and none of them support something as simple as left/right volume balance.
Why is that? Even $5 desktop speakers from the 90s supported left/right balance control.
And how do folks deal with the situation? E.g. if your listening location is not exactly in the center between two speakers in a stereo configuration, or if you just want to make one speaker louder than the other due to the room's acoustics? None of the Play-Fi apps I've used had balance control.
A Phorus customer rep claimed that the speakers are designed so that changing "frequency balance" could damage the drivers, but I'm not sure they understood what I meant.