> Really bad example. I'm still searching for a music player that allows me to select music by filesystem location. Any ("consumer device" as you say) I can find shows you your music by artist or album or genre, and it doesn't pose me a problem (I won't use it though) as long as I can select files and whole directories from a filesystem.
Check out Vanilla Player. (It's in the F-Droid repo as well).
> Because I know where the music is on the filesystem even where I don't know the tags (because i'm the one who put the files where they are).
That's fine for you and me (I use %albumartist%/%releasedate% - %album%/%disc%[ - %disctitle]/%track%[ - %artist%] - %title%.%format%), but my mom and sister just drag'n'drop music and let the device sort things out, so filesystem browsing is approximately useless.