I've noticed this more and more over the years, both in job hunts and in watching colleagues work. For the former, having a broad collection of technologies on my resume often seems to draw the reaction of "So, you don't really know anything well?".

For the latter, it will often happen that an X programmer (for whatever X) knows their language quite well, but is utterly adrift if something happens that's outside of the language's abstraction. Often I'll debug something in a few minutes with 'strace', and they react like I just raised the dead.

If you're job hunting, you could do some A/B testing by generating a highly targeted resume for some specific tech that you know well, in addition to your "true" resume. Send the variants to different places and see what happens.