Why so pessimistic, Think about all the great use cases of this tech eg. When Elon Musk gets his Mars project going these will be invaluable to have on the spaceship. Or imagine a nyc with all buildings below ground, above ground, the entire city could be a park.

Hmm. Agree on that Elon is like the creator in Matrix Movie :)

These would be great in hospitals, not just for patients, but also people that work on the night shift and never see much daylight.

True that for people work in night shift will have fun with it. Also countries like Denmark where they hardly see sun will be glad to have this technology.

If we have fake sun and air which is indistinguishable from the real thing, why would you want the real thing?

I'm actually quite excited by the same reason -- if we can ween ourselves off of the sun with no side-effects, then that's one less roadblock between us and interstellar travel :D

It is just a way of thinking :)