Honestly, as someone whose code serves a significant portion of the Internet's images today, who has run encoding pipelines at the largest streaming companies in the world, and has seen both displays in person at a flagship store, I am eminently qualified to comment on this. Honestly.
Everything I've said is accurate. I use matte screens, but I don't use them where I don't need to because they hurt image quality, and I don't think it takes a trained eye to see the difference. Simple as that.
If someone asks me why I have a matte film on my iPad, I tell them it's because I often don't have a choice where I use it when I travel, and I really like using it near the bright window at my dinner table. But yeah, it doesn't look quiet as good as the iPad without the film next to it in normal areas. That's a simple and honest answer.
More to the point, don't tell people there isn't a difference. There is one. Anyone emotionally offended by the factual degradation in quality is having cognitive dissonance with their 500 dollar upgrade. Buying a nano-texture iMac only to have to return it is a huge waste of time ... and, as visual quality is something I think about every day, I'd like for folks to go into it with their eyes open.