Not sure if you meant to reply to me but I’ll answer anyway
Everything you mention is massively valuable but, depending on your goals, I think “practice” can be immensely useful in addition. Partially this is due to the extremely intimate nature by which you have to dissect the work of another creator. If that work is something you like then this insight I think can be invaluable to apply to your own creations.
The second reason is one of practicality. Presuming we are talking “practicing” instrument performance. It can be useful to try to obtain, and subsequently maintain, a level of technical ability that allows you to express what you want to musically, with minimum effort. To go far beyond that is possibly unnecessary but I think that is a pretty good target. Have your technical ability meet and allow your musical aspirations. It can be frustrating to be limited by it, a feeling a know all to well sadly.
I am presuming practice here means with musical expression beyond a point and not mechanical and repetitive drills (which can be counter productive). Ear training is the most overlooked thing to “research” out there. I fully agree with that.
I was only joking though
, it’s cool to see that people are enjoying music. I do too! Wouldn’t do it otherwise.