While we, as players, only need a single bed and a house, villagers require many buildings to live in the settlements. Because of that, it would be great to have more house options specifically for NPCs, especially since these models don’t need any interior design.
For example, it would be really cool to have a standalone version of the Medieval Fortress tower from @river tinsel mod that could be built in settlements, making them look like they have proper defenses while still housing my soldiers.