Except feed upside down...Push feed will do everything a CRF will do
In all seriousness, that is one of the reasons for CRF being a requirement with some I've been told.
I guess if you're flat on your back with a 400 pound lion leaping at you from 20 feet away this might be a consideration.
But I certainly "get it". Modern push-feeds with a good extractor (gimme an M-16) are extremely reliable, no less so than CRF's in my experience.