Educational institution, that’s what they gain from it.
Exactly. There's all these people being born in the tower, and now they've stapled on another 9 different worlds of varied technological advancement. They need a way to educate them all, and a world that's nothing but schools is a good shortcut.
I didn't even think of people having children in the tower
Remember he came back in time around 20 years I think and still was in the tower. They made lifes there
But yknow its kind of weird how no one questioned about the 29th floor... Like why mc choose that story for their floor even though it's doesn't looks like it has benefit for them. Or where's this white haired dude came from? Isn't he just suddenly appeared in their eyes?