Other audio manufacturers are still buying caps from Wilson so they must be doing something right. There may be some performance stats on the caps but I don't have that.
I represent several companies with "proprietary" tech, and I believe the proof is in the performance! Yes, it's hard to hear everything, especially products from more niche firms.
Dealers and manufacturers should also educate end-users on their technology and disclose as much information as possible without giving away their trade secrets. That said, we often overlook the critical importance of system synergy and focus solely on individual components and their proprietary assets. The professionals who can help audiophiles assemble a great system are the ones who matter most. Skills can only be learned through deep experience, hours of work, and a significant investment.