How do you know when to stop editing? I set a hard deadline for myself a few days before the real one, so I'm forced to call it done. Otherwise I'd just keep fussing with the words forever.
See, I've always found that cutting too much from the start can actually help me find the real story. Sometimes you have to strip away all the extra stuff you thought was important to see the simple plot that works. Mike might have been trimming the wrong parts, like losing a key detail that explains a character's choice later. It's more about smart cuts, not just making it shorter.