It's only clumsy is if you're naive enough to completely disregard the one obvious characteristic that all top level athletes share, no matter what the sport - the need to succeed. Yeah, no shit, I know. But that's the thing, because that 'particular problem' you're referring to is far more general than you care to admit, which is that it's extremely difficult succeed at the top and eke out those margins unless you're willing to go that bit further. That's not about 'nuances', that's just how sports and other competitive environments work, and the constant flow of positives and scandals in general are a testament to that, not a testament to how successful anti-doping programs are.
I don't really expect much more from USADA now. Science can only advance so fast. But it's for that same reason that you can't unequivocally declare it a success, because you simply don't know how deep the problem runs. For example, when Ricco was busted back in 2008, he was using a form of EPO thought to be untraceable. It had genuinely been untraceable, and he was ahead of the curve, during which time he'd be given the benefit of the doubt because science had yet to catch up to him. Little did people know during that period. And that's where cycling is relevant, because it's a great example about being cautious and gaining some perspective in how big the battle is. So, ultimately, saying, "it's doing what its designed to do" doesn't fill me with much confidence when there are obvious reasons to remain cynical.