Ya, this is definitely the case. If you never read the Grimoire cards, then you basically get no info on the backstory at all. And what’s funny, is that there are MULTIPLE times when the voice actors say crap like you mention. Aside from the Exo chick saying that, you also have the Speaker guy say, “I could tell you stories about the traveler, and the collapse, and all this shit you totally probably want to know… but whatev’s, I’m not gonna.”
The Vex, for instance… the thing you kill at the end of the game? Apparently NOT actually the central core of the Vex themselves… instead, perhaps, it’s some thing that they either encountered or created, and started following/worshipping. That’s kind of cool. I’d like to know more about that. Likewise, the whole notion of time manipulation by the Vex is pretty cool, and how you actually end up fighting Vex from different points along the timeline, with the precursor and ancestor Vex.
And then there are the Fallen, who also have some fairly complex social hierarchy, and apparently had some big advanced empire at some point.
And then you have the Queen of the Awoken, who apparently killed/defeated the Kell from the House of Wolves, and now runs that house of the Fallen. But this itself is basically not explained other than a 5 second sequence where you see the fallen body guards she has.
Then there’s the Hive, who apparently worship/follow some god/king way the hell out in space somewhere, called Oryx, who sent Crota to this area to subjugate things. There is some suggestion that the Hive guys are almost undead type entities. Not really explained beyond that though.
There’s just so much stuff that is THERE, but is seemingly only developed to a foundational degree. It gives me high hopes for the game moving forward, as I think Bungie could really make some awesome stuff around what’s there. But I also kind of want to know more about that stuff NOW.