I only said 'Titanic' is unwatchable because one can not watch it.
All good work requires self-revelation.
Don't let the difficulty of actually achieving a shot make you think that the shot is good.
For any director with a little lucidity, masterpieces are films that come to you by accident.
All great work is preparing yourself for the accident to happen.
The varying physical characteristics of the actors may also necessitate changes. Sean Connery is six feet four. Dustin Hoffman isn't.