For the most part it is not even cached! I agree it is not hoarding, I would say even collecting the FLAC files is not really hoarding per se. Something becomes hoarding when it turns into an unhealthy, uncontrollable obsession, maybe like an addiction. It becomes a fine line between a hobby and an addiction!! For most hobbies, it serves as a release from tension, stress, fears.
For me, it is good to focus more on the music and the happiness it generates in the present moment. Don’t worry about the gear and the library and the meta data. That’s why I always like the What Are We Listening to Now thread!