You know, I'm really starting to regret reading comments. Not just here, but literally every gaming forum I come across, because of ignorant angry children like Brometheus. The developers are not your slaves. They are not under any obligation to do what you want. If you have an idea, and can express it with proper english and commas, they actually listen. When it's a sound idea, something simple and easily implemented, they go "Yeah okay I'll try to get it in the next pass." If it's not feasible, or not within the scope of their development plan, they say "No thanks, try modding." It's clear they're not ignoring everyone, but it's also clear (to me at least) they know what the hell they're doing.
That all being said, I understand why some others are upset with the mystery dossiers. I personally have zero interest in anything that isn't a dinosaur, but this is their game and they'll do with it as they please, so what's the use in complaining? You take one look at a pteranodon, brontosaurus, or the oversized "D. rex" and you realize this game isn't meant to be a prehistory simulator. It's a survival game with dinosaurs (and other things). If you want something different, I suggest you look elsewhere. If you can't find the dino simulator you want, I suggest you make it yourself.