Yes it is very much a double edged sword. The other risk associated with highly passionate Devs is that one day the work your business values no longer accommodates what tooling they want to work with, or they themselves change tack sporadically after discovering something new. I've had amazing JavaScript developers quit on me because they got bored of using react and wanted to pursue a role in Vue, for example.

But I'll take hiring (and the implied difficulty in finding) a dozen of those kind of Devs over drifters all the same.