I think most residential homes in the US aren’t the work of architects these days, but designers. The difference being credentials, not diligence/skill. Either

I think most residential homes in the US aren’t the work of architects these days, but designers. The difference being credentials, not diligence/skill. Either way I suspect they aren’t optimizing for living space, but salability and construction cost. That’s what buyers will actually use in decisions - ability to pay and perception of quality/value.