Space is big. You just won't believe how vastly, hugely, mind-bogglingly big it is. I mean, you may think it's a long way down the road to the drug store, but that's just peanuts to space.
I don't think there is anything wrong with white space. I don't think it's a problem to have a blank wall.
When I go on the set, I'm so rushed. When I see the actors at rehearsal, when I love it, I want to keep the mood - my mood and the actors' mood also. So I have to push the crew faster. I don't want to lose the mood.