This is one of those language features that you can't unsee after you learn about it. In hindsight it feels like it should have been common sense, like avoiding

This is one of those language features that you can't unsee after you learn about it. In hindsight it feels like it should have been common sense, like avoiding or preventing global variables, GOTO statements, mutable state, etc. And usually you start noticing that good software developers have already been practicing it by instinct.