Eventually, you won't need to do this and the Soup views will be playable directly on the player. But for now it's a good work-around.

I think I have issues similar to Dave's. I now have what I would call "artist bloat" due to the way that I re-tagged tracks from compilations (changed from "various" to actual artist name). My artists playlist is filling up with one-hit wonders. I'm dependent on being able to play by soup view in order to be able to play some of these compilations by album title or to play tracks by year.

Ultimately, I expect that I may still drag tracks from soup view into new playlists (like drag all 1960-1969 into "60s"), but I hope that recreation of playlists will be minimized if soup-based play becomes available. For now, I'm holding off creating a lot of soup-derived playlists. Cross my fingers!