To me, a film is like a piece of architecture. There are so many details that all, in the end, end up being one thing.
I want to cast correctly, and then I want them to live on screen. If I cast the wrong actor, I'm screwed. But, if I cast the right actor, it really works out. The casting process is so important.
The core of a director is the person's tastes in what elements go together and how they go together. It's a puzzle.
I have to be strong about my own tastes because I think that's what the director's job is.
If your taste goes wrong or you listen to other people's tastes too much, even though they could make a fantastic movie out of it with their own tastes, if they blend their tastes with mine, it's probably going to be a mess.