long title, but appropriate question. Say you're mixing a single. I hear two main thoughts out there to deliver the mix to a mastering house - 1. put as little effects on the mix bus, especially like saturation and compression.....that's the job of the mastering engineer. And 2. there's the thought that you want to make it sound as good as possible. What if, in order to make it sound as good as possible, you have to break rule 1? I'm just ignoring both rules, and making it sound as polished as it can in the mix, whether I use mix bus effects or not. The only thing I avoid on a mix bus is the limiter, because the master house wants a quiet mix of -24 LUFS anyway to give them headroom. No need for a limiter on my end.