The Mirco playfields vary from generation to generation an even run to run.
Anytime you are dealing with wood,plastic and coatings as well as chemistry in general it can be a mixed bag.
What I recommend is take each and everything on a case by case basis.
You have chipping down to the wood on a low play game?
There is an adhesion problem between the wood and the initial layers of art.
You have clear chipping off the art but art remains intact?
You have a clear adhesion problem or it is simply wear with the clear being the first line of defense.
That is all it comes down to.
If you see wood or ghosting it is on the ground floor
If it is clear only issues it is typical wear or at the top coat level.
Doesn’t matter who made it that is what you are dealing with.
Just a general guideline to follow.