Earlier quoted context omitted.
Have you seen the amount of changes George Lucas did when editing the prequel trilogy of Star Wars? They were digitally composing individual actor performances within a shot.
Isn't Lucas known for being an outlier in the industry in his devotion to post-production editing? I honestly don't know. But I am unsure that other production teams are capable of pulling this off and shipping on schedule with the same aptitude.
Honestly it's almost more notable these days when that kind of stuff doesn't happen.
You're basically paying more money to decouple and delay decisions as much as possible.