I'm not sure the two things are mutually exclusive. Being a "computing adult" doesn't mean that you don't enjoy tinkering. The kind of stuff that you mention,

I'm not sure the two things are mutually exclusive. Being a "computing adult" doesn't mean that you don't enjoy tinkering. The kind of stuff that you mention, like building a carputer, is something that I'd do for fun, not because I really wanted a way to play MP3s.