The question is how would we expect people to react when practically speaking, their entire civilisation has been wiped out?
I think alot of it would play out as shown in NuBSG, but, I don't believe everybody, all the time would be so depressing. I believe there would be lighter moments, there would be some fun and some moments of joy. Now, maybe we can say those happened off camera, but, they went overboard with the "real Grit" removing the lighter moments/fun/joy, so, the "reality pendulum" swung over to the other side and became unrealistic
One Day I hope to be the Man my Cat thinks I am
Where are we going? And why are we in this Handbasket?