I totally agree with the point about always needing to learn on front-end because things are always changing...but having recently been exposed to the Java worl

I totally agree with the point about always needing to learn on front-end because things are always changing...but having recently been exposed to the Java world there is a huge amount of stuff there too and if you're a server side dev then it's constantly changing e.g. you're org has a django app now but what about Go, Clojure, Scala, Haskell, etc, etc, etc. Different tech for different use cases but there are constantly evolving options out there. Things are always changing but that's the beauty of it, isn't it?