Dont be bummed, you are getting at exactly what I am talking about - which is noticeably absent in what I am seeing in some offerings both with the WWII combatives guys and others in the modern combatives industry - they generally dont spend a lot of time on the ground, since it is of course "the last place you want to be in a real fight," and their answers to the dilemma of a ground fight in the real world are ample evidence of the fact that they dont.
I'm a judoka first and foremost. You mention turnovers( to which I would add sweeps, reversals, etc.) This is key to real world fighting.
If MMA has shown us ANYTHING, it is that the guy that can maintain a dominant position in top control and strike will do devastating damage on his grounded adversary.
It has also shown us that even when considering EXPERT grapplers, and against not-so-expert grapplers, hanging out on your back whether in guard or out is NOT the place to be in a real world fight when strikes are allowed and things like a fence can be used to block escaping movements.
As least in Judo you train to not get pinned, and to get out of pins when you are controlled on your back. Where the sport has polluted the self defense aspect is the turtling - this is WORSE than being on your back in a real fight.
But a gaurd should be transitional. This is where we should be working the HARDEST to get the opponent off, to make distance, to create turnovers and escapes, etc.
For the real world, this has to be done while controlling in some way the assailants hands - weapons have a nasty habit of showing up. Every combatives instructor mentions this in their classes, videos, etc.
When you get to the action, though, we see a lot of lame attempts at strikes from the bottom with no leverage possible, almost a total lack of realistic sweeps or turnovers, and techniques which tie up both the defenders hands with bullshit "front figure four necklocks" which anyone with halfway decent pain tolerance guts out in regular practice, let alone in an adrenalized (and maybe drug assisted) real fight. And while tying up both the defenders hands, they leave one or both the attackers hands free!