I agree, and likely this will happen, as no matter what, some playfield ghosting is not going to be "covered" by Stern.
I have a hairline, on Tobin. For fun, I took a super fine, black enamel paint pen, and ran a stright short line...1/4"
Its gone, cant ever see, but yes, that will wear off over time, without a mylar or sealant layer...not doing that yet.
However, where I have done this on a whitewater, its 2 years now, and at home use, hasnt worn off.
Obviously, this wont cover chips, larger issues, but I got so paranoid, and forced OCD that I dont have, I stare at the inserts
now, checking that a beanstalk isnt growing out of the playfield.
The thin black line can be remved by me with ease, but now, Im not looking....
Some form of Insert Cover, as mentioned by Manimal, may end up being a solution for some......not great, but ghosting or not, still enjoying the game!