First of all, don't run anything "LTS" on a dev box. You really want a "rolling release" for that purpose. Something like Debian Testing (as it's the most compatible).

Secondly it's very well possible to remove features from a language. It just needs to be well enough designed that there is a good migration story (ideally though automatic rewrite by the compiler). Just see what Scala 3 did!

https://docs.scala-lang.org/scala3/reference/dropped-feature...