It's quite useful for movies that were edited to meet a length but don't actually have the content to match. Some speed can raise the interest density to make i

It's quite useful for movies that were edited to meet a length but don't actually have the content to match. Some speed can raise the interest density to make it watchable again. Also/similarly for some older movies which have a slower-paced style that doesn't fit today's conventions and expectations. Slower takes more art/skill to do more with less, and it's so refreshing when it works. [Same for wide shots rather than close-up frantically-cut action.] I'd never speed those up, and rather watch them on a day I have the time.