This is a problem in some contexts but not others. Much software is run in environments controlled by the same party as the code. If one needs a new feature, on

This is a problem in some contexts but not others. Much software is run in environments controlled by the same party as the code. If one needs a new feature, one upgrades. Dependency management for software you're distributing is a hassle, to be sure. The version of the language is one of many considerations. System calls, memory constraints, paths, and many other things can differ from one environment to another.