I shoot primarily sports and often am in a crunch to edit and turn highlights around as quickly as possible. Deleting unnecessary clips during timeouts or halftime helps me to streamline my ingest and edit work flow.
It is a bit risky, I admit, but in five years of working with P2 I’ve only accidentally deleted a clip I still needed once. *Knock on wood*
I find it an extremely helpful feature and am disappointed that it sounds like Sony doesn’t have it.