I was always in the camp that there was no such thing as 'anti-glare' only 'average-glare' where everything was washed out. Which has always been true before.
Yeah, that's about how I thought of matte vs gloss back in the day as well. What you're seeing is screen+glare. I can either focus the glare in one place and totally wipe out the on-screen content in that area, or I can spread that same energy across the screen and make everything equally bad. If the ambient light is strong, then equally bad is unreadable, if the ambient light is low then it just gets washed out.
If you search far enough back in the forum archives, you'll probably find threads where I'm arguing strenuously in favor of gloss over matte.
My experience with the nano-texture has been quite different. Yes, there is still that effect, but to a much smaller degree and the screen is now able to power through the glare. I think there's a few factors at work: better anti-reflective coatings allow more light to pass through the coverglass and into the display where it dissipates rather than reflect, the nano-texture I believe is doing what they claim and scattering the light in a much more effective way, but also you've got a much brighter screen than we used to have so screen has a fighting chance in the screen+glare mashup.
It's not going to let you see brilliant high contrast colors with the sun behind you-- it's still a developing technology and thus distinguishable from magic-- but sitting in a office with uncovered windows is no longer a problem for me. I'm not doing high accuracy color grading or anything, but for text work or watching a movie? Much clearer and less fatiguing on my eyes.
I've also got a regular and nano-texture ASD on my desk and both look quite usable in the room and better than my M1 MPB, but in the standard display I can see what's behind me and how many fingers I'm holding up, the nano-texture has none of that. If you push it, you can see light gradients under intense light which is what people mean when they say the "lose contrast"-- but no content is lost anywhere on the screen for me.
It's truly remarkable to me. The standard screens used to feel high contrast and have more pop, but now they feel like I'm looking at everything underwater where there's this annoying reflection on the surface at a different focal depth than the content I want to see.
Different people will certainly have different sensitivities, but I haven't found a use case yet where I don't prefer the nano. Not for the ASD, not for the iPad, my next MBP will certainly be nano, and I look forward to it coming to the iPhone where I think it will have the biggest impact.