>Multi use rooms require TVs

That seems an overstatement. I now have one in my entire house (don't have kids).

There's a fairly large TV panel on one wall in basically a sitting room. Otherwise I just use a computer. A relative basically has TVs in every room. I guess it maybe made sense when he was rebuilding anyway but it still seems excessive to me who might sit down to watch a movie or show but doesn't have live TV.

But, then, I don't have AC either in Massachusetts.

If you are rich you have single-use rooms. Hell, even I have a sleeping room, a cat room and a hacking room. It's not that expensive. The cat room doubles as a mini-cinema.

Ambient light is dealt with having nice thick blackout drapes.

This is not some rocket science, it was done for like a hundred years.

edit: actually in my former apartment I just bought a roll-down projector screen that completely covered the window. pull down - zero ambient light even in full sunshine.