As a Playback Operator I use Pro Tools when providing my own rig. It allows me to receive PT sessions directly from the pre-record sessions if needed. Also I can send my PT sessions directly to post if they need to see what kind of edits were made on set. I'm very skilled in PT and can make changes or edits or anything that can be imagined very quickly without holding up production.
I've also used Logic Pro, Audacity, Garageband, and even iTunes for playback with no problems. I have been asked if I HAVE Pro Tools but never been told "you have to use PT for playback."