The ippon in judo signifies instant victory in combat. it goes off the basis that a perfect judo throw in the battlefield would end the fight instantly.
In freestyle wrestling you get awarded 5 points if you can lift the legs over the head, called a high amplitude throw.
Now if we were to make a argument between sport and combat its obvious why you are rewarded points for throws. its not about getting top control of a person, its the damage the throw itself causes.
I see this new rule as a way to punish wrestlers by not directly rewarded them for a takedown by forcing a grappling element on them, having to have top control for 3 seconds. This can only hurt a wrestler or judoka because this will limit the points they will get in a fight by forcing a extra element on them.
ultimately dirty holt is right, its not about self defense, its about changing the rules to promote your own art. Infact I think one the most best self defense apsects of wrestling/grappling is the throw for the brute force of it without having commit to the ground. that and the technical standup, takedown defense and the clinch.
if we really wanted to look at it from a self defense point of view how is a berimbolo better than a high amplitude throw? yet if you did a high amplitude throw in bjj you would probably get disqualified for slamming because there is a perception in the bjj world that they are dangerous even thought they are 100% legal in their rule book.
The judo rule made sense up until three decades ago. At that time, an ippon throw meant your opponent was thrown very hard, landed flat on their back, and you were either still standing, or on top of them. Since then they've changed the criteria - most modern ippons wouldn't have scored at all in the 70's or before. You can get a sense of how much this has changed by watching matches from the 60's and 70's that are youtube.
The control was, in the past, always a big element of a judo score. If I threw you hard, but after the rolling you ended up on top, not only wouldn't I get a score for the initial throw, but you'd get a score for countering.
In the 80's the IJF, in its infinite wisdom, decided the way to make judo more IOC friendly was to change that, so now you get soft, rolling ippons where the "thrower" overrotates and ends up on the bottom (and which would have scored for the person who ended up on top before the change). Most of us old time judoka think the modern ippon is garbage, and think that getting into the Olympics was the worst thing to happen to judo (and would love to give its spot to BJJ, if we could get back old fashioned judo, with lots of ground work, no illegal grips except hanging onto the belt, 15 minute matches, and very stiff scoring on throws). Would you buy a used Olympic slot from us? :icon_chee
So I'd say, this new BJJ rule, where you need control, is a good thing. It was good in old time judo, and it's good for grappling in general. Of course, if BJJ gets into the Olympics, it'll be gone, because they'll figure they need a lot of scores to keep the IOC happy (and actually, I suspect the IOC didn't even care that much, so long as people watched).