The problem is finding the middle ground. There's only so much I can learn, and only so much time to learn it. I don't want to spend my time spinning my wheels learning $NEXT_BIG_THING only for it to be superseded by $NEXT_BIG_THING+1 by the time I master it.
I think both are an example of an aversion to deep learning.
My personal theory is it's some mix of imposter syndrome and fear of missing out. If you don't keep up with the latest tech then sooner or later you'll be found out and ejected from the pack, never to draw another sv paycheck again.