I’m not using a screen protector, and I still notice the washed out effect.
I finally made some head way with apple support. The new senior advisor I talked with today (not the same one I’ve been talking with for a few days) said that she’s had other calls about this issue (First Lady I had said she hadn’t had any) and the engineers are in fact looking into it. She did say she had no idea when it will be addressed, but they do know of the problem and that it’s iOS 12 related. So I guess that’s something!?
Its certainly very noticeable with a screen protector because you see light scattering , perhaps its washed out without a screen protector, either way im convinced its the whites. My phone looks great now.