I question the validity of this argument in multiple dimensions:On the other hand, the top 7 free throw shooters of all time (and like 99 of the top 100?) shot free throws traditionally. Why shoot it like Barry when you can shoot it like Steph...and look less ridiculous in doing so?
No doubt vanity plays a role and yeah, if you've reached Shaq level free throw shooting ineptitude, it can't hurt to experiment with different techniques. But you also can't fault a guy for using the same technique as 99% of history's greatest free throw shooters.
1) There is no comparison data. For all we know even the best shooters may have been better had they switched. 99% of the best high jumpers did not use the Fosbury Flop for a long time after it was introduced. "It looked stupid."
2) The argument is being based on statistical outliers (Curry, Shaq) vs. the central 99% of the data. The stats indicate that it is hard to be an 85%+ FT shooter using the standard method. It is really easy to become an 85%+ FT shooter using the Barry method. 90% is quite achievable.
Open challenge: Watch a video on the technique and then try it in your driveway. If you are not over 80% within your first hour of serious trying, please report back. If I can do it (non BB player), I expect pretty much anyone can.
If the goal is to increase the FT accuracy of 99% of the players, the Barry method is the way to go. There will always be outliers for whom a different method is better/close (e.g. Curry).