I know people who don't have the discipline to keep spaces open, but large open spaces can be wonderful (and easy to maintain). The tough thing is maintaining large arrays of intricate special-purpose rooms which you don't need and which are full of stuff that makes it feel small nonetheless.

Space is wonderful for doing things like dancing, hosting guests, exercise, communal/family cooking (sprouting many kilograms of chickpeas, fermenting 40+qt of kimchi).