A glossy screen makes more sense where you can control the lighting, like in an office. And less sense outdoors, on a train, at a café, etc, where a 13" is more likely to be used because it is more portable.
For me, the point of having a laptop is to be portable. I use mine 2-6 hours daily moving about where I can't control he lighting. I absolutely don't want a glossy screen here. I also use my laptop 8 hour daily in office at a desk. In clamshell mode connected to a large external display. So a small footprint is essential here.
A laptop larger than 13" doesn't meet my needs, it is not so portable and would steal space at my desk. And I will never buy a glossy laptop.