It's classic Apple to spend over a decade insisting that that glossy screens were the best option, and then to eventually roll out a matte screen as a "premium" feature with a bunch of marketing around it.
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This reduced overall image quality and caused pixel-fine details, such as small text, to appear smeary on high-density LCDs. In contrast, well-designed glossy displays provide a superior visual experience by minimizing internal refraction and reflecting ambient light at high angles, which reduces display pollution. Consequently, glossy screens often appear much brighter, blacks appear blacker without being washed out, colors show a higher dynamic range, and small details remain crisper. High-quality glass glossy displays are often easy to use even in full daylight, and reflections are manageable because they are full optical reflections with correct depth, allowing the user to focus on the screen content.
Apple's "nano texture" matte screens were engineered to solve the specific optical problems of traditional matte finishes, the washed-out colors and smeary details. But they cost more to make. The glossy option is still available, and still good.
You know what's glossy? Movie posters and postcards.
I still say for comfortable all day viewing and productivity, there is no comparison. Glossy does have more pop on a phone or watching movies in the dark, but I'd go blind doing that all day every day..