Is there seriously nothing else to report than Fincher doing a shitload of takes? He has explained his process before, and with some good sense. And even if his process were absolutely ridiculous and non-sensical — as long as he keeps delivering work on a level of mastery beyond most other productions, I couldn't care less.
Fincher is exacting. He is after memorable and authentic performances, and if he has found his surefire way of arriving at these performances by exhausting the actors' self-awareness and pretense? Way to go!
Come on people, I really wish you'd find new insights to report. I'm going to be a prick and say this is just lazy reporting.
Cheers to Pavlov, and pardon my rant.