Here we go with the salesman stuff again. Every surgeon that does any cosmetic surgery is a salesman by definition, since its an optional surgery that potential patients have to seek out on their own. Hence they need to do things that makes them more visible and/or marketable in their own way, whether that be branded nails(G-nail and betzbone are just branded A-nails fyi), competitive prices, billboards, etc. That doesnt necessary make them bad doctors at all, that just makes them doctors that also want to make some side money from their typical legit medical services...cant blame them for that.
Back to topic, what Dr. Paley told me that I resonated with is that the doctor him/herself is far more important than whatever nail is chosen. He of course thinks precise is the best(he did co-invent it so I assume he gets more profit as well), but also said that while other nails have their own pros/cons, theyre fine too if used by the right hands. Though I didnt ask him about the HNL nail because I never heard of it... but if its built/regulated by a legit western company and used by doctors in developed countries, its probably just as viable as other nails.