I have noticed horizontal light banding on dark areas when gaming on my Xbox One X with VRR enabled. I updated to 1403 which has improved but not eliminated the issue. I spoke to both Samsung and Xbox who haven't been able to fix it completely. VRR makes a massive difference but this banding is slightly annoying.
Just got my 90T sunday and im super disapointed with the gaming mode super dark washed out and worst of all these terrible horizontal lines.
I really wanted a Samsung but it's looking like I might have to return the TV and soundsystem and go with Sony...