The playfield scratch situation is the result of two things:
1) The carbon balls JJP includes with the game are naturally soft. All carbon balls are soft and nick/pit easily. So this will be an issue with ANY game where carbon balls are used. Carbon balls are soft, but way harder than the clear. So when they pit and scratch they then do the same to the playfield. I recommend doing anything possible to be able to use Chrome balls in your games. This mostly includes sticking a Pinbits protector in the trough to prevent stuck balls from magnetism. Chrome balls are much harder than carbon balls and take much longer to become damaging to the playfield.
2) Mirco playfields have a poor paint process. Not only do they chip easier but they wear faster than any other pf I've worked with including CGCs new stuff (not great but better than Mirco), classic Diamond Plate and PPG clear I've used in restores.
While you can't do much about #2 on JJP games, you can help the situation by using super shiny chrome balls like the Ball Baron Ninja or Titan's premium chrome balls.