It’s easier to understand, easier to review for correctness, and less likely to cause problems with additional changes in the future. Even though it sounds counterintuitive, software developers generally try to write as little code as possible. Any code you write is a potential liability that has to be maintained, so if you can instead just call code that others have already written and that has been tested, you’ll want to do that. (Note that “less code” doesn’t mean fewer lines of code, it means less logical complexity, which is often, but not always, also less in terms of characters/lines)
I’ll use it anyways. Because, fuck it, I despise people like that
The problem is not about the person you intend to insult “earning it” or not, the problem is that by your choice of insult, you’re implying that you also despise other mentally impaired people, no matter if they’ve done anything wrong.