Thank you for sharing that, it includes the same frustrations that I have, plus one possible work around that I need to try.
The solutions are simple, using a finger, especially my apparently big fat finger, to adjust the volume slider is a royal pain, too high, too low, too many attempts at small slides to get it to where I want it to be. If the volume buttons are not an option (and they would be the best option) then either making the slider less granular or, even better, simply adding + and - buttons at each end of the slider to allow for adjustments of one slider unit at a time would entirely solve my problem. It really isn't that hard to fix this issue with a solution that would be acceptable.
I haven’t tried in a while (so I’m not sure if it’s still like that) but I believe that if you tap on the slider to the right of where the volume indicator is, it increases volume by 1, and if you tap to the left of it, it lowers it by 1. Not optimal, but useful if you are trying to get two or more speakers to play at the exact same volume.