Things games should have, but don't

[Chaoxys]

Games need to have it so when you say you don't need something explained, they don't explain it. I've played so many RPGs where someone will ask "So do you know how ______ works?", and I'll say yes, and they will respond with "Oh, so you already know that you can (long written out tutorial on subject I already know about) then?".

Seriously, I said I know how it works, so just leave it at that.