In MR reviews of displays that is sometimes the case and sometimes not. It was certainly not mentioned at all in their recent (Feb 2025) review of the ASUS ProArt 5k (I searched the entire transcript of their full video review). Here's what MR wrote:
"the appeal is not the looks of the body or the materials used but how your max content looks on the actual display itself and with that it's pretty much right up there with Apple Studio display in terms of that quality ...if functionality is your main priority which I'm definitely hammering home here it should be for you you'll absolutely be happy with this monitor ...the main reason why I recommend this display because I am so used to a studio display or Pro display or just any display from Apple and I'm just quite frankly spoiled at how good they are for my daily use and nothing has really matched that until now."
Yet none of this is true if you're buying a 5k for text sharpness (which many are), and you have good vision, since the ASUS display is matte and thus can't match the glossy Apple Retina displays in that key attribute.
They said 'anti-reflective coating' in the review and it's in the product documentation and should be in the specs before you click the buy buttom. Regardless I'm not here to defend and nitpick the details of every review that was done on these monitors. I'm just stating that the specs for these monitors are matte and not glossy. If you buy a matte monitor thinking it's glossy then that is your own fault and since Apple sells many devices with matte retina displays which you keep ignoring in your posts.
I work in a very brightly-lit room, with a combination of interior lights and ample natural light, and I get no reflections on my glossy iMac. So if you're using your external display indoors (as woud most typically be the case), you'd need to have unusually challenging lighting conditions for text to look better with a matte coating.
It's not relevant if you personally get reflections or not in your room as you can have light in a room without the type of reflections I am talking about. It's that reflections will show more if direct light hits it since a glossy screen will reflect light specularly while a matte will diffuse it. Thats one of the reasons most monitors are matte and why Apple offers matte options. There is nothing magical about glossy Apple displays that prevents it from adhering to the physics of light despite what your personal situation is. I own a glossy 5k iMac and it will absolutely show reflections if direct light hits it. If glossy didn't have these issues it would be far more popular.
I'm not here to convince you which one is better(i own both). I am stating both and pros and cons of both and before you click the buy button it states you are buying a matte display. Once again, if you want glossy display than this is obviously not the monitor you want but you should see this in the product description.

