It is kinda expensive, isn't it? Especially for something that can't achieve 'perfection'.
Besides, my perfection is different than yours, or likely anyone else's. I am not anti-PLEK, though, I am just a 'find a great tech you know and trust and will listen to what you need' kinda guy.
Plek...Good topic for an insomniac

Way back when, Plek started out as a mass production machine for factories. To Martin or GIbson or even Collings and Suhr the idea was for a massive up front investment in 21st century tech, you'll eventually get highly repeatable results in a fraction of the time, without worrying about variable results from even the best human doing fine detail handwork...once you get passed the machine's learning curve. I get this angle, but it's also used by some companies to hide their poor mass production methods like installing frets in the board before its even glued on the neck. It's really no different than the argument for a CNC vs. pin routers and shapers. A machine is doing what used to be done by human hands, but a human still has to program the right parameters to get proper results.
Anyhoo, the difference is that no one buys a CNC for repair purposes. But with Plek, Joe Glaser who has a wide reputation among building, repair, and the total Nashville scene was involved very early. I remember the store getting cold calls trying to sign up new service centers like Buzzy Feiten would, or every new whiz bang guitar, bass, and amp maker trying to build out a dealer network.
Fast forward years later...now Sweetwater offers Plek as an aftermarket upsell on new guitars. From their website "Unless a guitar comes from the manufacturer already Plek'd, nearly all guitars will see a dramatic improvement in setup and playability after undergoing the Plek process at Sweetwater."
This just doesn't sit well with me. You can see where posts like the OP come from. Now it's gone from Plek is a high volume factory time saving and quality improvement fretwork tool to Plek is an overall setup upgrade process over non-Plek which is implied to be inferior. I guess at different price points lower quality is to be expected but I thought proper fretwork and setup is a required feature on new guitars, not an upgrade.