Video game "journalists" are full of hate and venom most of the time. No matter the game they will often publish scathing reviews because that's what people want to see. Humans are strange in that their first impression is often the most compelling for them, so it's difficult for people to overcome that initial reaction to what someone else is saying about something. I can see why video game developers would rather have customers make their own opinions with first hand experience, rather than relying on "video game journalists" who get early copies and pump out so much vile rhetoric. Lots of people don't want to like certain games for specific reason, so no matter how good the game will be, they're going to trash it and if they have an audience as a "journalist" they're going to sway a lot of people.
Destiny is a perfect example : great game overall, but had some early issues, and the "journalists" fucking destroyed that game. Meanwhile, a game like The Division was even worse at launch, but got great reviews.
I can see why developers wouldn't want these people to have early access, but I can see why consumers would like them to have early access. Me, I almost always wait a month or so after release anyways, so it's not an issue for me anymore. I got burned too many times with pre-ordering... fucking Halo 4 and Hitman : Absolution ruined me for pre-ordering. haha