Houses are horrifically boring all over the world. There are so many data points that people building stuff are happy when all the boxes are checked. As you've pointed out they usually follow demand but it's not a rule, it doesn't have to be that way. We do living room, kitchen, dining, bathroom, bedroom but you could do many different rooms. Say a proper office with all the trimmings perhaps a network connecting coworkers. You could do a space for home manufacturing. If you could just dock a truck properly and roll pallets in and out it would go a long way. Could do a district cooling system and/or a centralized pool pumping station. Could have a fee to gradually green the desert behind the homes.
But the true killer feature is lack of red tape.