> My job has less (no) global impact. What I did previously affected far more people. I told people what project I was on and they thought that was cool. But I don’t hate my life or job and I very much did before.

As I mentioned in my own comment, the root cause of burnout - be it coding or otherwise, is when expectations don't match reality.

For most people, especially the young, they attach their expectations to the job and work they do. There are also a certain number of people who have other expectations though - like how they can contribute to charity or the well-being of their own family from the money they make, from a job they don't necessarily like or even care about. One example is the popular Bain/McKinsey partner who is happy to sell absolute vaporware that will never be delivered ever, because they don't care whether their customers are happy - their own expectations are how bigger of a yatch or mansion they can upgrade to next year.

It all boils down to what the expectations are and whether they match reality.