I can't find it, but this question got asked somewhere (Reddit maybe) about 8-10 years ago, and a plumber took the time to respond that many plumbers are actually very passionate about what they do. They don't specifically unclog toilets for fun, but there are plumbers that spend a lot of their free time on plumbing forums, and even some who have projects experimenting with different ways to install certain things.
No I get that, it's just not for me that's all.
No, but you’ll see it for writers, musicians, and the like.
Engineering (software or not) can be an intellectually rewarding experience for many. I don’t know why some people find this something to scoff at, would you rather have no pleasure derived from your work?