Or me. I can’t speak for Ron, but I’ve never found paint to flake off plastic unless there’s something on the plastic that shouldn’t be there, like mould release agent (the usual culprit), and that’s actually very rare in most kits.
To give an example of durability: until a couple of years ago, I used to play Warhammer 40K regularly, usually with a mix of metal and plastic figures. The metal figures, I primed and sealed carefully with a couple of strong coats of varnish, and for transport, sandwiched between two layers of acoustic foam so they wouldn’t touch any other models. Plastic figures, OTOH, I didn’t prime and gave a lighter coat of varnish, then just chucked all of them together into a container that I packed tight with figures and styrofoam worms etc. No paint ever wore off the plastic figures, but try packing metal figures like that and you can repaint them after transporting them once.