I hate watching reflections on my screens. My old laptop had a super reflective screen. So does my tablet and smartphone, but I was successful in applying anti-glare on them. Reflective screens are annoying in any condition besides total darkness. Anti-glare is such an improvement! Yes, I lose a small amount of brightness, but I need a lot less brightness when my screen is not a freaking mirror!
Hence the question, "Why don't more screens come with anti-reflective coating?"