The thing is, for most people a glossy monitor with an AR coating is a good compromise, since reflections are a lot more distracting than a slightly matte finish. For a studio monitor this isn't a consideration, but in general the finish is mentioned in the specifications.
The problem is, some monitors aren’t “slightly matte” - many are very matte, and you can’t tell just how matte they are into you receive them, since the finish is always just called “matte”.
Glossy isn’t ideal but I’d definitely take it over spending $500 on a 4K ultra sharp display only to view everything through a fine layer of grainy rainbow colored dust.
Apple’s nano-matte technology seems like it could be a wonderful albeit expensive compromise, but I know I and many others are willing to pay the premium.