I agree there is more twist in a deep socket. But with 2 similar sockets, Say an SK and a Snap I think the torque it takes to use either one is the same. You don't change the setting with a torque wrench with different sockets or extensions.
But all this **** which is way over my head don't mean a pinch of **** to a bolt. Only a few of the fasteners I deal with are even critical, torques 1 set of head bolts to an old tractor in the last year and didn't even bother looking it up.
This is what the question is about,,, is it worth it? You might be able to prove it is but its not night and day and most people are not using this on hi test bolts 24/7. That some shave or tiny sliver is somehow worth it, as someone said,,, 10-15% better in some ultimate situation and or test and 10 or 15,,, being conservative,,, x the price.
There is a point, does it work? Does it need to work better? With a welder or air comp you can double the price and the benefit can be obvious as daylight. My neighbor and good Bud who just died is a master of the deal. He had some snap stuff and I been around and used some of all of it.
I had a Grandfather collected a few things which my uncle gets most of. I have a few pieces, its great and any number of reasons why its good but if it all was gone and I had to start over today would march a credit card right down to HF to get my feet under myself and see what happened when the dust settled.
My other Bud, He had SK stuff along the way for small sets and it was nice, got another all Snaps, aint one of those guys worked in mine ever said you need better tools. . I need a better tool box.