I'm with Mike O all the way here. Just the state of some of the non adhesive mylar rings in this thread tells you all you need to know about what has happened. These games were not well maintained. If you take the time to restore a game, then maintain it. If the platters are so bad that they're curled up and you couldn't read anything through them, it's a maintenence issue. Not a platter issue.
This is my Royal Guard that I restored 8 years ago. It has received fairly regular play in the years since. This is how the non adhesive mylars and the playfield underneath look today. The area under the bumpers was like a lot of the playfield, pretty roached. I had to sand out the ball wear groove in the upper arch, it was so bad the ball would hang in it.

Royal Guard platters (resized).jpg

In a home environment you'll probably never face the issue but the problem with the adhesive mylar is, well, it's adhesive. If it gets messed up you run the chance of paint loss trying to remove it.

Again, the results from the non adhesive mylar platters are because nobody maintained the game, not that the mylar caused the damage.

I'd bet they are original because in order to replace them, you need to remove the bumpers. And the condition of those bumpers tells you that has never been done.

Sure. But you really only need a normal waxing. If you put down multiple coats it really won't give any more protection

I'd use non adhesive or no mylar at all but it's not my playfield. Good luck however you proceed

If it's after years of abuse and neglect then the platters didn't cause the damage. The abuse and neglect did. Just like it caused all the other playfield damage you're likely to find.

Unless you're not going to maintain your game which I can't believe you'd do, you'll never see that kind of damage again in a home environment. Probably not even if you routed the game. Maintaining it will prevent it.

It can. See above.

Oh ok. Case closed? Well then...