I got it. For some reason, I missed it before despite carefully looking for it twice. Well, what can I say in my defense? Nothing.
I agree with your general idea, but it is from the viewpoint of "music is the reason" while I have a feeling that many people are really in it to play with their toys. The music becomes an excuse. I see it as LEGO for adults, in some way. It just happens to be with equipment that reproduces sounds, but it could be anything else. The goal is to play with it and not necessarily to play it. I think those are two different groups of owners of a little bit pricier/more sophisticated equipment. One that buys it because it simply sounds better while they play music and the other one that is in it for building, rebuilding, outsmarting other hobbyists (just look at this thread), etc. I feel that many people from the second group convinced themselves that they are in it for music, while they really enjoy the "construction" part of their activity.
Look at this thread, or many others for that matter, and you will see how much time and effort people put in chasing something by trying new things. For example, I was really curious what "tuning" would encompass. I came out with a conclusion that it is a fluid process that, if you believed in it, you would have to do, more or less, every day. That would require focus on what has been achieved with certain move and then waiting for it to "settle"/"burn in"/whatever else. From what I gathered, the time would be dedicated to changing/improving sound which just seems too much work and too little play to me. I tend to turn the equipment on and leave it playing until I go to sleep. Building was just to get to the point when sound is satisfactory enough not to ask for more tinkering. It could be better, but what the heck. I have no time for listening carefully for a week to figure out if some compound placed on top of my amplifier would change the sound for better. In fact, now when I think about it, it would probably obstruct the airflow and first page of instructions says not to do so.
You seem to fall into the first of my two groups. People who have a system to listen to music on. It is not a hobby, I agree. Other group is not less valid and, I think, they are just as happy with their game. It is a hobby and it happens to use same tools as yours and mine.