I get that. But spending a lot of money on things that don't make it to the final cut always felt like a waste to me. I'm very very marginally into filmmaking (see bio), and I've always had the impression that costs and time could be cut drastically just with better planning.
I often wonder what would happen if you applied startup principles to making a movie. Thinking in terms of MVP, customer value, efficiency, on top of the artistic vision. This is not just talk, I'm putting my ideas to practice by producing two zero-budget feature films with an extremely lean mentality. Let's see how they turn out :)