Matte screens, otherwise known as anti-glare screens.
In the recent iMacs and MBP, Apple has reduced glare, but you can still see a distinct image reflection. I realize that glossy screens give nicer pop-colors, but for some people it is a trade off depending on priorities. Since I mostly write text, I stare at a screen sometimes 18 hours a day. I do not want any distracting images in the background. The matte, anti-glare screen diffuses the reflection. That is the "tool" I referred to that Apple has removed. Now, Apple only sells 100% glossy screens. The anti-glare is not even offered as a paid-option. Why?
Any arguments as to the superiority of glossy screens are true. They are best, in some circumstances. But in the circumstances I use them for, glossy screens are not superior. It is horses for courses. I happen to value non-reflection rather than pop-color.
If I was doing Facebook and watching movies, I would prefer a glossy screen.
But for staring at a screen for 18 hours a day mostly writing and reading, I prefer a non-reflective screen with no discernible image reflection.