Hawkeye....No harm no foul...We're all ultimately here for the same reason...passion for pinball.
However, some of your assertions aren't practical. The breakdown of plastic when exposed to petroleum doesn't occur in front of your eyes. But it does over time. In this thread alone, you've seen two posts by real people as to the probability of millwax affecting plastics. Disintegrated star posts and the millwax bottle itself chemically changing. So to ask someone post that they watched damage occur before their eyes isn't practical.
For the most part, the pinball hobby enthusiasts, at least those who have publicly posted on RGP, Pinside, KLOV, et al have mostly universally panned millwax and any benefits it might offer. All you have to do is google millwax and you'll be presented with dozens and dozens of threads populated by some pretty heavy weight individuals in the pinball world, who vote against its use. We don't need a laboratory or chemist to affirm a ground swell of practical experience and knowledge that says don't use. If it has petroleum in it, it will harm plastics. That's a fact. There's been several past discussions where the MSDS (material data safety sheets) were linked for this product that showed it had petroleum in it. Maybe they've changed formulation since, but why risk it?
Yes, there's the one pinball author that has been a proponent of its use in his book, and Steve Young has promoted it once upon a time on PBR. However, Steve is of the 60's and 70's Gottlieb EM era....Not of the modern day mylared, clear coated, diamond plated playfields.
Pinball machines are expensive toys. Better to air on the side of caution and use what's nearly universally accepted for cleaning: Novus products. And for Waxing: Carnuba's. Why risk using a product that has any controversy surrounding it?