This is interesting. I think, by and large, the concept of “millennial burnout” is just a new name on a very old phenomenon. The one contributing factor now that I think is different from the past is specialization. You could commit yourself to a smaller, singular space, but I hope you pick the right one, because within a few years everything else will have passed you by so far that there is virtually no going back.
I read or learn about people hundreds of years ago making groundbreaking discoveries in physics or biology who were self-taught. People who learned calculus in their spare time. Hobbyists. Scamming for every book they can get hands on, if you will.
It boggles my mind. Today, you can’t even get your foot in the door without a decade of specialized education. Want to study anthropology? Cool, here’s a dozen books on anthropology. And history. Go ahead and learn a couple languages - spoken and programming. Data science. Statistical modelling. CAD. Good? Now pick a single aspect of a single time in a single place and study nothing but that for the rest of your life.
This isn’t to imply that things were more egalitarian or meritocratic back then - obviously there were many systems in place deciding who got these opportunities and who didn’t. But today, the realm of the autodidact is the realm of crackpots and conspiracy theorists. But hey, by my experience, those people never burnout, so maybe they’re on to something.