>In my professional experience, people that are always learning new languages or are constantly using new libraries and frameworks are never the ones who accomplish the most.

There's a huge difference between chasing fashion and seeking out what is new that is actually better.

I agree that those people are usually worse. The ones that pick up on new stuff that isn't necessarily fashionable, assess it intelligently and balance the trade offs of the good vs the bad - those are the better programmers.

IME scala programmers are better - mostly because they tend to be programmers who got frustrated with java's shortcomings and realized scala solved many of those shortcomings, not because it's fashionable to learn scala.

IMO people who chased mongo, on the other hand, demonstrated a responsiveness to large marketing budgets rather than critical thinking skills.

You don't have to try out every new technology either. There are some that you just have to read a bit about to know enough to dismiss them.