It's definitely a plus if you're already an avid user but I think it shouldn't be a requirement. Say, if you wanted to learn about compilers, you can efficient

It's definitely a plus if you're already an avid user but I think it shouldn't be a requirement. Say, if you wanted to learn about compilers, you can efficiently extract a lot more knowledge by going through the source and docs of a real-world compiler project, regardless of your usage, than by merely reading compiler texts.