I have seen this mentioned on the forums but I wanted to add an entry on this forum so people can show support. Many people including myself prefer to browse by album artist and this is very important functionality for us 😊
Right now I have about 500 albums in my collection and with the way Poweramp currently handles album artist mode, (I think it only takes that one tag into account), more than one hundred of those albums art not visible when I click on a particular artist because they are sorted into the unknown category. When I use another player like Musicbee or Blackplayer that falls back to the Artist tag 99.9% of my albums/tracks are sorted perfectly. I could theortically go thought my entire collection and retag all of the problems but this small piece of functionality fixes a very common issue. Other than this one inconvenience Poweramp is the best player I've found by far, including desktop players.