For what it is worth, I have added the path as a criteria to use when creating smart playlists so you can create your own dynamic playlists based on folder locations.
One more contribution from me on having to pay for "yet another" app,
1. functionality other than basic functions, that should be in an app, is a personal opinion
2. different/competing products in the market place are the result of differentiation. Each tries to gain market share by offering something different/unique
by extension, if you like something in other players like Rocket player and PlayerPro do you then contact those developers with for instance the fact that they should at least have the same sound quality or equaliser functionality as Poweramp ( differentiators imho), as quality of sound is something you would expect in a music player