Alright, not saying I'm some BJJ expert since I'm just a white belt and I no longer compete, but I do remember very clearly that even attempting 50/50 position in both gi and no-gi matches for BJJ would result in a dq for most tourneys expect for brown/black belt and even then, not many would allow it. Note I live in California and while I've trained under a reputable instructor (Eduardo Fraga, he runs a Gracie gym out of Berkeley), I understand some parts of the US don't follow this ruleset but even then, those gyms that did teach and have tourneys that allowed heel hooks for anything outside of brown/black were frowned upon.
Are you saying that you frequent tourneys that allow heel hooks? What belt are you? Not trying to stir shit, just honestly curious because it is a very dangerous move. I do believe it is different than a kimura for example where the time to tap vs injury is much lower.
Almost all no gi tournaments allow heel hooks for their advanced divisions.
Even the conservative and brazilian IBJJF recently legalized heel hooks for black belts at their no-gi tournaments
