Exceptions: enforcing code quality that cannot be automated; punctuation in documentation (you WILL use capital letters and periods and complete sentences, so quit complaining about it); encouraging good habits (like using `map` and `filter` and `reduce` instead of `forEach` or `for...in`).
So it's not a waste of time, but pick your battles. Sometimes nits need to be picked so you have some easy-to-grok code and documentation.