OK, in the hope that you might realise something I am going to try one more time.
You said "Lol if you attempted that with a focal shutter. " I took that to mean you didn't think that shot could be taken with the equipment to hand with a focal plane shutter equipped camera.
Hobby's ambient exposure was 1/500, iso 200 @f8, my suggestion to replicate that with a slower sync speed was 1/250, iso 100 @f8, that gives exactly the same ambient exposure. No killing needed, the ambient is exposed exactly the same with both the leaf shutter and the focal plane shutter equipped bodies. Now as I said the flash exposure, the separation, is slightly different, his flash exposure is one flash 1/1 one flash 1/4 power, iso 200 and f8, mine is both flashes 1/1 iso 100 and f8, that means the flash exposure is around 1/3 stop different. Doesn't that prove your hyperbole to be incorrect? You can take that shot with a focal plane shutter, you implied you couldn't.
Are there shots you can take with a leaf shutter that you can't take with a focal plane shutter? YES, but the example you held up is not one of them.
As to your example image. To me it shows a certain youthful exuberance, the kind of image you will look back on in a few years and think 'How could I mess up my exposure so badly? Why would I show that to anybody? Thank god I got better.'
I am sure you will say it looks better in real life, that the clients loved it, that the burnt out edges are not burnt out on the file etc etc. But if that is the best example you can produce to demonstrate balancing light sources you have a long way to go, my friend.
As for saying you know nothing about sync speed, I never did say such a thing, I just demonstrated that you know nothing about the practical use of leaf shutters and high sync speeds, and there is a subtle difference in the two.