May be a domain issue? If you're largely coding within a JS framework (which most software devs are tbf) then that makes total sense. If you're working in something like fintech or games, perhaps less so.

My last job was a mix of Ruby, Python, Bash, SQL, and Javascript (and CSS and HTML). One or two jobs before that it was all those plus a smattering of C. A few jobs before that it was C# and Perl.