Cafes aren’t typically open late at all. And sure movie theaters are open but not really what I’m thinking about when I think of nightlife...
But you're right that it's mostly cultural, and I wish we in the west had a culture of keeping family activities open outside of normal business hours.
nightlife is still very much optimized for single adults who like to drink here, and just pointing out in Asia you have districts that only come alive at night and have a lot of things to do that don’t involve drinking at a bar.
Reading at a bar is like a “happy path” in some ways...people want other alternatives than just standing around a loud crowded bar on a weekend.
The reason is cultural is because the weather forces you to do things at afternoon/night when it has cooled down.
I definitely believe that the culture has been influenced by the weather so ultimate it's the weather.