Imagine a large American 2 story house, where the "Owners Retreat" is on the first floor, a single bedroom, bathroom, multiple cosets sometimes with a small separate kitchenette, laundry, and reading/tv/living space.
This makes a lot more sense for what I'm planning to build. We're used to calling it "Master bedroom" where I'm from, but I always imagined I'd want some sort of suite or apartment, separate from the rest of the house.