Every playfield is unique because the wood is from different trees Ofcourse so some playfields will have it, some won't.
Some dimples are from the wood and some from the clearcoat. It's going to be impossible to say.
I can only add that I have never seen a playfield on any game, from any manufacturer without pre existing dimpling.
Some have a small amount everywhere, some have a large amount only in some areas, some a combination.
The playfield is wood, the bealls are steel like others have said. What can you do ? Nothing from any factory mass produced games or you just play it and change the playfield in 5 or 10 years of you don't like the factory finish.
It's probably time to seek answers from Sterns engineering/product development dept for those who are worried.
The fact that every playfield is unique because of the wood means you are going to probably going to end up going in circles.
We are back to wood and steel balls.
We are back to people having major different personal tastes and expectations.
It's going to be a personal decision here and some will care and others won't.
Can anyone definitively say what dimpling is or isn't caused by.
Only the people who make the playfields can probably answer this.
I don't think the clear should be described as thincoat. I think it's fairer to say it's standard factory clearcoat. The same as any of the manufacturers have done over the past 30 years. Everyone has their own opinion. As long as u are happy with your own and unique game, that is all that matters..
P.S - the zombies artwork look great on the playfield don't they.