Another thing about Go, and more generally, the statically-typed languages, is that these utility functions are generally safer to get a once-over and a commit into the code base than in dynamically-typed languages. Something that joins an array of strings with a joiner in some non-trivial way is a lot easier to review when you don't have to worry about it getting an array of DOM nodes and a NaN for the join character, and all the other things that could come in. Well-tested little utilities for Javascript are valuable, and I don't 100% trust LLMs to not give me code based on common misconceptions rather than the actually correct code in that case. Or at least, correct for some definition of correct, which in the dynamic languages can itself be some work to figure out.