I did not know of this, pretty cool, but still why not a storyline explaining why and how that happened, borrow some ideas from MMorpgs and explore. Having players just run around randomly killing eachother isnt a good idea IMO.
Though these airdrops kind of remind me of Hunger Games and thats pretty cool.
I'm not worried at all. It's super early and they are focused on the core gameplay, and yet already have a quest system in place that they can expand on. Relax and give them some time.