If you ever did acting before you would understand how difficult it is to get a scene just right and how misguided your statement is.
"Everybody's heard those nightmare stories of somebody doing a take 20, 30, 40 times. Other than obvious errors like forgetting a line, often I can't see any difference between take one and take 20."
https://www.dga.org/Craft/DGAQ/All-Articles/0309-Sept-2003/C...
Exactly my point!
> the reward of a better shot greatly outweighs that cost
My point, too, the "better shot" being the improvement of the lips and voice matching the movement and action. Consider that the English language market is most of the world.
I've seen it done, don't recall which movie it was.
> make a film
I'd love to do that. Wanna finance me?