Ok, and?they're into it because these characters seem familiar in ways they didn't in season 1, there's genuine character growth from characters like Riker, Troi, Data, etc., and the nostalgic elements are central themes of the plot.
I'm not saying it's just nostalgia. I am saying the majority is nostalgia and making people feel the warm fuzzy feelings of safety and familiarity. It's mac and cheese comfort food viewing and that's both ok, but also I'm not a fan of the cheese. And I'll say that.