How do you manage boring part though? Going mad because of boredom is a real thing. I definitely agree that some of my job is caused exclusively by my need to keep myself entertained. But what's the solution?

Another factor is resume driven development. Yes, you can frown upon it all the day, but in the end I'll switch company and I'll need to find a new job. And, like it or not, but everyone these days wants a lot of experience from their workers. I'd love to write C89 in the dark corner for the rest of my days for reasonable compensation, but I don't see those jobs, what I see is billion keywords k8s spring boot react query metrics jaeger aws yada-yada.