My two cents:
I started S&S in the spring of 2015. I have had some on and off periods, but I have been at it most of the past 9 years.
The exact S&S programme is for efficiency. If you follow it closely you will progress faster and easier than otherwise, I have to assume, as it is based on science, which is not just technology but human testing with trial and error. Whether it is exactly sets of 10 as opposed to 12 or 8 I am sure does not make a huge difference. Whether it is 100 total swings or just 80 or 120, also I doubt this really matters much. Same with TGUs. Also, I doubt the exact weight matters much. The 32kg is a nice standard that I assume is sort of tied to the idea of the typically sized adult male. It is also a kind of maximum ''possible'' for the typical layman (I assume as well). I seem to find myself doing S&S a whole lot with just the 24kg, and it is just fine. Full power swings, long TGUs, everyone is happy, including me!
I think Steve Friedes said it well a long time ago when I did not really understand this stuff much when he said that the swing is 80% of it and the TGU just 20% of it. This is something I eventually really took to heart. It is maybe a sad truth that to get that 20% you have to work a lot harder and longer than for the 80%, hehe. But just because something (like the TGU) _feels_ like you are getting a better workout does not mean that this is scientifically true. The 1 handed swings activate more of your muscles by far than the TGU (as I understand it), even though the swings are really easy to do!
For the crazy fighting sport of judo it is the two handed swings that seemed to have the best carryover. You need full body power for judo, so this must be why. But, for developing your muscles, the 1h swings are a lot better. So, I definitely privilege the 1h swings. Life is not just judo. The 1h swings are still good for judo but are not as good as 2h swings if your goal is only to win at judo.
After 9 years of S&S: I am not as strong as serious barbell lifters my size or larger that I know. These guys deadlift like 600+ pounds. I cannot do this. I can deadlift 150% my own bodyweight easily from S&S, and I have inched this amount up with some dedicated training at a few points in the past 9 years, but I am not a barbell lifter, I am a kettlebeller. Grappling with these guys, again they are definitely stronger, but I am not a pushover, which I think is a testament to S&S's effectiveness. However, I am talking about really good barbell lifters. Comparing me to just about anyone else, I think I am a whole lot stronger or at least no weaker, and ALL of these guys lift weights seriously in some form or other.
S&S also seemed to make it easy to learn to do the 1h pushup.
So, where am I now with S&S? Well, today I did the whole S&S routine with the 24kg. Yesterday it was mainly with the 28kg. Two days ago it was with a mix of these and the 32kg. I do sets of 2h swings too when I feel like it with the 32kg or 40kg. I definitely privilege the 1h swings over the 2h swings and the TGUs. I GTG the 1h swings a lot as they are easy to do and take little time. The TGUs are more time intensive and awkward, so less good for GTG.
In any case, my thoughts are that the key thing is the 1h swings and I will do as many as I want, often a lot more than just 100 a day. I do the TGUs as often as I can, but I am not too worried about them provided that I do some kind of pushing, which I always do in the form of presses and dips. The TGU seems better than these by far, but again we are talking about only 20% whereas the swings are 80%, so if I am only getting like 10% instead of 20%, the final mark is still 90%, which is good enough!
1h swings rule.