This is exactly what I've been saying, only you put it better, CP. As to the USA models' tuning machines, folks might be surprised that the PRS Core tuners are made for them by Gotoh (if memory serves). They're not US parts. They're just very good parts. The tuners that came on my PS acoustic were sourced from Robson in the UK. They're also very good parts. I want to talk about tiny details and parts for a moment. I've had a series of McCartys going back to around 2001 or so (I was mostly a CU22 buyer before that). One problem I occasionally had with each of them was a certain amount of what I call 'plink' with certain notes, whether plugged or unplugged. These guitars also had the older Vintage tuners. It wasn't a deal-breaker, I loved them, and they did well for me on lots of projects. In 2017, I had two WL McCartys that had the Paul's Guitar bridge, with brass inserts in the aluminum stop tail and Phase III lockers. One had a mahogany neck, the other maple. For whatever reason - this may just have been sheer luck, of course - the 'plink' was gone and the tone was extremely solid from the fundamental through the harmonic series on both guitars. Coincidence? Maybe. It was a small sample size. Nonetheless it was audible. My feeling was that a few tiny changes added up to making them sound better.