That seems pretty minor to be fair. Others have reported the entire screen dimming, a whine coming from the monitor, and lines appearing in the browser tabs.
It's strange how zoom level affects it. I've seen people say reducing the contrast or sharpness to very low levels through the OSD will also prevent it. Also increasing the black stabiliser to 18 or higher works for some. Hopefully it is some firmware glitch they can iron out.
The screen does dim if there is bright content displayed on it in the first place... not if it's fairly dark like the ROG wallpaper. It dims because scanlines cutting through the image by 50% cause it to appear to be less bright.
I agree with you that the issue is 'minor' but only because it takes a certain set of circumstances or pattern to be displayed before it even occurs. If it happened randomly without prerequisites, then it'd be terrible because:
i) Mobile phone video still isn't the best. It's shaky, only 1080p on my mid-range smartphone, keeps refocusing, has a crummy bitrate for attempting to capture details like this,
and is not in perfect sync so there is a slight flickering. So what I'm trying to say is that the scanlines are worse than they appear in the video.
ii) You simply don't want to see artifacts like this no matter how faint or hard to reproduce on a computer monitor that is meant to be superior at near-range compared to TVs (although we all know OLED is the way to go, everything else be damned).
iii) Never mind dead pixels or backlight uniformity... scanlines create the appearance of 50% dead pixels and a failing backlight...