I think of wrestling as a form of self defense first, sport second. So when I see a guy on his belly just throwing his hands out to the side and not trying to get up, I think that I could punch him into submission if I needed to. I also think that if I were the one who got taken down, I would like to know how to get up. Folkstyle teaches that and awards you when you do. I don't know if their intention was self defense when they made the rules, but that's how I envision it.
I envision that with judo too, which is why I take tradition judo instead of "sport judo". The differences are between a rolling throw and one that could knock a guy out on the street. I prefer to know how to knock someone out.
The hanging on ankles thing, IMO, does need to be addressed, yet if the dude on the bottom can't get you off his ankles then I would say you are still in control. Let's face it, dude trying to get out would if he could but he can't so other guy must be in control. Isn't that what control is, getting someone to do what you want them to do or stopping them from doing what they want?