An architect will optimise for liveable space. Whoever pays them can choose less liveable space in exchange for a chase. Most normal house purchasers won´t go for it.
Perhaps the tradeoff is that for any given house price, the time & money cost of planning and adding "hidden" features that buyers seldom think to prioritize, has to be offset by reductions in other value that buyers are more likely to notice. But, not necessarily space.
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.