But unless the 'grabee' doesn't do anything, someone grabbing one foot from someone is likely using both hands (and most of their upper body) to attempt to control it - and there is a second foot/leg out there free to cause a lot of damage if they're willing.
It's not a 'one and done'/'game over' scenario by any stretch of the imagination if the party is even a little motivated.
Though I suspect most folks in this thread have no exposure to an actual fight beyond watching a video somewhere, so....
Also, many powerful leg locks entries fail to succeed in MMA, due to overcommitment of limbs.
Also. Chimps/Primates. Don't they fight more in packs.
So if the competition was 5 on 1, would the tail become an even greater disadvantage. It would be even harder to maneuver or run, become someone could grab the tail.
So this leads to a utilitarian equation - is the additional counterbalance going to provide a sufficient edge to override the risk it adds of a relatively weak limb that can be grabbed?
Because muay thai has a very structured set of rules and an environment which constrains it so that is the case. much less so than western boxing obviously, but the issue is even more obvious there.
generally still way better than no training of course.
BJJ folks consistently beat Muay Thai competitors in MMA for this reason.
being able to do both, plus some krav maga strikes? even better! though most krav maga if done with full earnestness would get you thrown in jail outside of a legit self defense scenario.
By the way, in full traditional muay thai, both quick and prolonged stand-up grappling is trained for.
BJJ is as often about transitioning to and from, and controlling on the ground fighting - so having both would be pretty solid ‘academically’ probably.
It’s not like if you get jumped in a dark alley by someone they’ll just back off and let you get up if you fall down. Unless they were really stupid anyway.
Same with broken bottles, random street junk used as weapons, knives, multiple opponents, etc.
Which neither are going to teach you much about practically in real life, but better than nothing.
I think I forgot to mention how the best way to win a fight is to not get in one? Haha.