What's the elite set up like in the US?
For example, here in the UK, team GB train like professional athletes at the English institute of sport in Sheffield.
They have several top coaches as well as dedicated S&C specialists, Physiotherapists, nutritionists, sports psychologists etc.
Furthermore, the boxers are funded so the don't have to work. There job effectively is to train with the goal of bringing home medals.
I know many other top am box nations have similar set ups (i.e. Cuba, Ukraine, Russia, Kazakhstan etc).
Not sure why USA am boxing appears to be struggling in comparison to their previous success.
I have watched quite a bit of the top young (i.e. 12-15 year olds) boxers from the US on Youtube, and on the whole, their skill set appears to be well above that of the top UK juniors.
Maybe they need to focus more on the European am box style - which essentially is geared towards the computer scoring system.