I agree fully. I basically never download music anymore, because I can get all the music I can think of on Spotify for a few bucks a month.
I recently started music pirating because I listen to a lot of genres and I want to shuffle them. If I use Spotify, I am limited to their shitty shuffler, but if I download my music offline, I can shuffle however I want. My favorite algorithm to shuffle my huge bunch of music is to shuffle them by genre. Now I get to listen to interesting music with full control over the algorithm used.
Also, there are frequent power cuts in my area, so an offline library always proves useful. I also visit places where internet connections are not available.