People have made "nerdiness" a premium because other nerds view it as passion. The rationale is that if you craft something out of passion, it will somehow be better than. I think it also comes down to the fact that many tech nerds view engineering more as a art than cold engineering, and they view themselves as artists and artisans.
There's also this age-old belief that if you do something out of passion, you're willing to pull more hours, and do whatever it takes to reach your goals.
I also believe that nerds, whatever thing they are obsessed with, make their nerdiness a personality defending trait. Their nerdiness is their personality. And if others aren't as willing to commit, they're simply frauds or wannabes.
Probably one of the most ego-crushing realizations (if you're a nerd) is to discover that there are people out there MUCH more talented and higher performing than what you'll ever be, but with none of the obsession or pride. In other profession that's not really a topic. You can be a top performer in other professions, without a deep interest, clock out 4 daily, and never think about work outside work.
In tech, however, it is too often assumed that you must be consumed by tech. Otherwise you're not really that passionate about it.