Comment by pjlegato

Yes, totally. I can understand why management does this. Coders have a very high turnover rate as a profession. When your genius Clojure or Rust programmer leaves, it's much harder and more expensive to find a replacement than when your PHP or Rails programmer quits.

This then incentivizes new coders to take up one of the popular languages, because that's what most of the advertised jobs are for, creating a self-reinforcing positive feedback loop.