This has never been discussed. So I will give my observations, and see if anyone has anything to say on the subject.
I have a Les Paul that came Plek'ed. Without question, you can set the action lower than on my other guitars. For anyone unfamiliar, the Plek machine is a German computerized robot that will dress the frets on the guitar. This allows it to remove non uniformities. That is, a guitar frets are dressed perfectly when fret buzz appears at the same time on all strings and at all places as you keep setting lower the action as low as possible.
My impression of the process is very positive.
I haven't heard of this before, but most Parker guitars come with special frets that have more or less to my understanding been given a similar treatment (or at least have a similar outcome) to what you're describing. In other words, yeah, I notice a difference too (real smooth fret action, feels like butter on your fingertips. Haven't tried a Plek'd neck but the Parker frets feel different to anything I've ever tried).
This was first used by Framus Guitars, a German custo guitar factory. I allows you to keep the strings extremely clos to the fret. But compared to high end guitars there isn't such a big diffrence because those guitar are built by hand and can be nearly low ajusted.
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