Not gonna lie, that was a slick submission and I had no idea you could actually get enough knee torque from the leg grapevine itself from mount to get a sub.
That said, I think you are arguing a different point. No one is disputing that the skilled grappler can do the same dirty tactics from a better position and also defend them better. The main issue though is that if said tactics are done first, they can be a fight ender regardless of who does them. This is why they can have an equalising effect. We have seen top MMA fighters writhing on the floor in agony for minutes, following taking a clean hit to the groin
through a protective cup. Those moves wouldnt require excessive skills than you see outside the bar. So if your grappling habits put in danger of this, then the untrained guy may just take the opportunity first and that would be it.
Also there is the related question, what about if it was two relatively knowledgeable grapplers both utilising such tactics in a no rules situation? That is interesting in that they could use these tactics to prevent the getting of certain positions or to end it outright.
I mean you get a sense quite quickly when you roll with this in mind about where is safe, and where you wouldn't want a stray hand or knee coming near you. Remember that both Judo, which BJJ derives from, and wrestling are competitive sports first with these methods obviously removed.
This is what always irritated me about the 'BJJ invades Judo school and taps people' vids. You have the usual commentary by BJJ guy "Judoka gets the throw... but then the fight doesn't end like in Judo rules so we keep going, and eventually I secure the submission". Well what about if you spar randori on a wooden floor? Then the guy who gets thrown may not get up which is the idea and why a throw is an
ippon in Judo and wrestling.
Regarding your question, let's see my old favourite Scarf hold.
View attachment 1016560
Standard control in Judo and Sambo, flows from a throw and can lead to neck cranks and arm triangle choke. Most importantly it's also safe from groin attacks and also largely from eye gouging apart from the opponents free arm but it can be minimised with putting the head down to apply pressure.
According to the BJJ school of thought though, it's a liability because 'you can get your back taken' (not true if done properly).
So they much prefer this, a standard side control to transition from.
View attachment 1016561
As is clearly visible though, not only is your groin now easily in reach of the opponents hand, you head can also easily be gouged by the other hand. It's a much less safe position from a self defence perspective (aside from the fact your head is also facing down reducing visibility of surroundings).
So this is just one example why the rules set overlooks obvious dangers and directs the sport in a potentially less realistic way.