I mean, I know that it does terrible damage, but that's just from watching a lot of UFC. I think you're right though. It doesn't really *look* like they're hitting it very hard, and I don't think the average person sees that as an area of the body which can have serious pain inflicted upon it.
I honestly don't know why it isn't a primary weapon of almost every fighter's arsenal. The lead leg is there for the taking if you can keep them guessing with your attack vectors.
Agreed, my point and maybe I didn’t emphasize enough, is beyond the fight and cage performance, that damage takes way longer than I think a casual fan would think to get better.