Directors as Project-Managers

Always wondered how much vision directors possess ... the good ones I mean.

It’s a tough job.

Its one thing to read a screenplay and make a movie but imagining the whole in that much detail before it is created must require a lot ...
I mean - they just make bits and pieces - here and there - and all the time they have to have the complete picture in mind - well its not just a picture but a movie ... you know with motion and all ... the shots, camera angles, pauses, effects, continuity, story, emotions, locations, weather, lighting, people, schedules, costs ... and everything else that goes into making a movie ...

I guess that’s why the screenplay guy is so important as well ...

My point -
This duo would probably be best suited to manage cutting-edge projects - where the final product has never been created but the idea exists on some sketchy plane ... no?
IT, R&D, Technology ... u know ...