A hell of a lot of writer/directors write unshootable scripts with lots of descriptions because they want to capture the feeling as much as the action.

I wonder if part of the problem he's talking about is due to film writing experts encouraging people to write industry standard shooting scripts which can be very dull and too boring to read. They even encourage people to read published scripts, to work out their secrets, which of course were never used during the actual shoot. They are the product of every amendment during shoot and what's left after the editor's been at it and not the inspiring piece of writing which first got the funding and the cast attached.