> And if I display the exact same frame twice in a row at 48fps I get 24fps.
Not quite. Shooting at 48fps requires a faster shutter speed than 24fps (1/48 vs 1/96) which gives you less motion blur.
Not quite. Shooting at 48fps requires a faster shutter speed than 24fps (1/48 vs 1/96) which gives you less motion blur.
And if the film maker wants blur sometimes, they can still add it, without compromising the entire film.