I'm not sure if it just works differently somehow, but one of my most used ways of playing music in Poweramp in V2 was folder hierarchy and then long pressing a folder that contains a lot of subfolders and choosing shuffle.
This way I could shuffle by Album.
So Poweramp would play one of my albums (folders) and then continue to the next, but only within the parent folder I selected to shuffle.
In this version Poweramp doesn't restrict this to the parent folder I selected but shuffles all my songs.
I think it was called shuffle by list in V2 but in V3 there is only sh