I think you are missing the point. People do stuff because they enjoy doing it. The fact that they enjoy doing stuff you don't is their business, and frankly it would be a boring world if we all liked the same things.
You said they enjoy doing it. But I have a hard time imagining someone laboriously perfecting something (but never actually doing so) as an enjoyable activity. In fact, it sounds like hell to me.
Constantly striving towards further and further unattainable goals (even if it's just after finishing one project having a further one to do and etc. etc. etc.) is basically the most fulfilling life possible for a human. It's a major reason people are often much less depressed when they are busy with their work or studies.
According to your logic, people who are deep in their working lives should be experiencing hell, while retired people should be extremely happy. Do you actually think this is true? I mean honestly I have no idea what you think because you're all over this thread demonstrating that you have little to no grasp of basic human psychology