I had WSD on my wife's and my N20Us that we pre-ordered. Fingerprint reader accuracy was horrible.
She developed micro cracks almost immediately. She took hers off and was so happy with the FPS accuracy that she didn't put anything back on.
I took mine off a few weeks later because I hated the FPS issues, and I really hated the lip near the edges. The feel of that lip bothered me, and made it difficult to touch the edges of the screen; i.e. trying to access my edge panels...
So we've been running without screen protectors since, and our screens are fine. We ran our Note 9s with no screen protectors for 2 years, and they were fine and Samsung accepted them for trade.
At $80 that I paid for the pair of WSDs, I figure from now on I'll keep that money in my pocket. My insurance will replace a screen for $29. Much better deal IMHO - plus I get to use the phone as Samsung intended.