When I am building stations, I don't always care about the same things. Without getting too deep into the genome project magic, it would be nice if it was possible to weight the relative importance of lyrics, vocals, and instrumental aspects of the songs for a particular station.
As examples: A station that is intended to be all upbeat lyrics in a variety of styles, a station for powerhouse vocalists in a variety of styles, a station that is intended to emphasize the instrumental style regardless of the lyrics or vocal characteristics. All much easier to create if we can tell the system what we are focused on, although all would still need good seeds to get the system to catch what it is about the lyrics, vocalists, and instrumentation we are interested in.
I am sure a lot of people would like it if lyrics and maybe live versions were opt in/out as well, so that making instrumental or all-singable channels would be easier and those who are opposed to listening to the audience sing could get that out of the way without having to use potentially system-confusing thumbs to express those preferences.