Does it though? I agree that passively turtling is a big mistake, but turning to the knees and then standing up is a proven escape option in MMA. Sure it’s risky, but so is staying pinned on the bottom
not really. it is a very solid way of getting up and standing up while protecting the vital areas. you have to learn to protect your underhook space. then turtle game starts to open up and you can wrestle, stand-up, sweep, transition, roll out of there etc.
craig jones made a whole instructional around the idea of turtling and standing up especially for mma. back exposure is ok and not at all same thing as giving someone your back w free underhooks