I am very sympathetic to your ordeal. But I would also like you to consider a few counter points.
Consider this very hypothetical scenario. For a particular diagnosis, an experimental treatment improved outcomes compared to a control group by 40%. That may seem promising, but if the control group success rate is 10/100 and the treatment group success rate is 14/100, that means the NHS would need to treat 100 people to get 4 additional positive outcomes. If the treatment is really expensive or if it has severe side effects, then quite frankly, cost benefit needs to be considered. And another thing to consider, is its possible that your treatment was a false positive. It might seem crazy to you based on your experience, but the population is very large, and there will always be those 'exceptional' cases. That is just how it works.
Also, the OP qualified his remark with the words 'deviation without justification'. It sounds like in your case the OB had plenty of justification because she was aware of studies with more comparable demographics that had better success. So really, it sounds like you just got lucky in that one of your specialists happened to have the right background. If you had had a different OB, then you would have been no better off in the US system.
And finally, a personal anecdote. I suffered a fairly nasty shoulder injury playing a contact sport. The injury (completely tore my AC joint) is quite common for the sport. My HMO (Kaiser) did not recommend surgery because it only has moderate success, and even if successful, it only marginally improves quality of life compared to no treatment. Somewhat coincidentally, 3 other teammates had the exact same injury that year. One was on Kaiser, and also did not get the surgery. The other two were on PPOs and both got the surgery (I largely suspect due to the financial incentives of PPOs, they tend to over-treat). In terms of recovery, I was mostly back to full function in about 6 weeks, whereas the surgery involved a 3-6 month recovery process. And after 4+ years, I have some minor stiffness every now and then but nothing too bothersome. So basically, every time you (or your company) pay your sky high insurance premiums, just realize that some portion of that money is going to pay for mostly unnecessary shoulder surgeries for recreational athletes.