What are the benefits of fast fallers?

Like a lot of us on r/smashbros I've been watching ZeRo's tier lists, and one thing he tends to mention is a character's fall speed. A lot of times he mentions it hinders the characters a fair amount, such as making said character's recovery game weak and making them combo fodder, and it got me thinking, what are the benefits of fast fallers?

It's always easier to point out the negatives in things, and the most noticeable negative you see with fast fallers is the fact they generally fall too fast to get back to the ledge from a good distance. Characters like Roy and Falcon don't have the best recoveries, and fast falling only hurts them more, and of course their fast falling speed makes them easier to combo, and characters like Dedede who have a large hitbox and falls incredibly fast are pretty much doomed to be combo fodder.

But for some reason, players seem to gravitate towards characters who fast fall, to the point that one of the main features of Project M was that everyone's fall speed was nearly tripled. What benefits do fast fallers have?