Yes - more vids of synthetic would have been good.
It does highlight one specific truth of synthetic line. It's going to stretch (ALL rope stretches)...and stretching stores energy, and that stored energy is dangerous. The big difference is that when synthetic cable snaps and recoils, it's a couple pounds of soft rope moving at high speed. When steel cable snaps, its ten or twenty times as much weight, and it's steel. That can do a LOT more damage. Synthetic line is likely to bruise.....steel cable can remove body parts.
That's also why I've started trying to get as many heavy metal pieces out of recovery systems as possible, and use things like soft shackles. One less hunk of metal to go flying. I can still remember the sound that the hook off the front of a TJ made as it flew through the air, punched through a hard top, and buried itself into the seat of another jeep. Not a sound that I ever want to hear again.