Proper error handling is the biggest problem in a vast majority of programs and rust makes that straightforward by providing a framework that works really well. I hate the `?` shortcut though. It's used horribly in many rust programs that I've seen because the programmers just use it as a half assed replacement for exceptions. Another gripe I have is that most library authors don't document what errors are returned in what situations and you're left making guesses or navigating through the library code to figure this out.