[kiba]

I mean, we could ensure that not a single person on Earth went hungry. We could do that today, with our level of food production technology. But we don't, because we don't like the economics of it. We could swallow it and do it anyway, but we refuse to.

It's really not a problem of economics. It's entirely a political problem.

That's just another way to create inequity. Would suck to live on anything but the top level, without sunlight in your home. Sure, maybe it's possible to get sunlight to everyone's home, but let's not pretend that would actually happen, out of the generosity of every builder's heart.

Not everybody care for natural sunlight. I certainly don't. Moreover, I see sunlight hitting the roof of my non-solar paneled house as uselessly bouncing and heating things up unnecessarily. Just another resources to be used and transformed into something more our liking.

If you're talking about open space for a sufficient definition of open space floor plan, then it's a question of engineering.