some people enjoy having many things. some people don't. if her philosophy helps you get your life in order, that's good! if it makes you mad, then it's not the strat for you. books like hers offer an approach - they don't aim to invalidate other ones.
-is a perfectly reasonable thing to do
-puts itself in the line of critique by virtue of existing, as is the social contract of putting a design into the world
but that's a separate entity from the philosophy itself.
the issue with public buildings and construction is that agency/choice wrt consuming that design and aesthetic is severely reduced. this is design choice on the personal level. different scale, different set of issues.