Die cleaning/polishing and die wear is two different things that happen to a die. Die wear will show on all devices as the die gets older from making thousands of coins. Die polishing/cleaning us used to cover die clashes that make the fields blend into the deeper parts of the die. Letters tend to weaken, details worn away quickly by over cleaning till the die breaks and finally retired. I've seen some weak reverses on 1989 Cents that were in the EDS die state. The cleaning/over polishing weakened areas after just making a few coin. It all happens, knowing the difference is the key.