[onion2k]

developers who can say "df said the disk is full", "when I try to connect to it, it times out while connecting and we don't even get a syn/ack back, but it works fine from my phone", etc

In a choice between two candidates for a web dev role it's going to come down to who's shows more interest in (say) CSS layout technologies or writing webpack plugins than any amount of UNIX knowledge. There's a minimum amount they'd need to know like navigating around a CLI and using NPM, but I certainly wouldn't expect a developer have any sort of sysadmin skillset.

I'm not suggesting it's bad to know them or that they're not nice things for a developer to have, just that I don't think they have any significant impact on the chances of getting hired.