Half of the things that you listed also require engagement outside of working hours (playing music, cooking, physics). It all boils down to how satisfied you ar

Half of the things that you listed also require engagement outside of working hours (playing music, cooking, physics). It all boils down to how satisfied you are with your competence. You can always work for companies that work with well-established stacks, don't change things every month, and your codebase is stable. You won't have to play catching up. The side-effect of that is, you "only" have whatever stack they're using as your marketable skillset.