Again, it's a tradeoff. Matte screens, because they scatter/diffuse incident light, are less vulnerable to external light sources changing the color representation and throwing your calibration off. (It's the same reason most color calibration software lets you switch between various configurations, e.g. day/night/etc. based on how much external light is coming in to your office). Hence why they're used for monitors intended for calibrated work. But the emitted light is scattered as well and is not as pure when it reaches your eye. A tradeoff.
My main point is that all the scuttlebutt about glossy displays being cheaper to produce because they wash out colors is just misinformed. They each have their advantages and disadvantages, but the claims you sometimes read of grotesquely poor color representation on glossy displays for some undefined reason are not accurate.