Real data is messy. ...It's all very noisy out there. Very hard to spot the tune. Like a piano in the next room, it's playing your song, but unfortunately it's out of whack, some of the strings are missing, and the pianist is tone deaf and drunk- I mean, the noise! Impossible!
Tom StoppardYou always end up with too much, so it's good to be part of the conversation about not just what you can omit, but how you are going to do the grammar of the omission, how you make things continue to work when there's something missing. It's your last chance to rewrite.
Tom Stoppard