This raises issues, but may be missing some important points.
Regarding the philosophy of ornament or not, brutalist architects were obsessed with texture. Many buildings that may seem at first to be without ornament actually had a huge amount of effort put into casting their concrete forms with rows of fins that stick out and are later roughly pounded back to form a particular look. This cost a lot of extra money even though it comes off as a rather plain texture to many.
And when it comes to cost analysis this take is very shallow. An interesting counterexample is the recent rebuilding of a hospital in Chinatown, San Francisco. The initial designs were extremely plain and boxy based on the idea that every bit of money spent on ornament could be spent on life saving devices instead. Only when a foundation was formed to raise money specifically for ornamentation of the building was that added to the design.
Regarding the philosophy of ornament or not, brutalist architects were obsessed with texture. Many buildings that may seem at first to be without ornament actually had a huge amount of effort put into casting their concrete forms with rows of fins that stick out and are later roughly pounded back to form a particular look. This cost a lot of extra money even though it comes off as a rather plain texture to many.
And when it comes to cost analysis this take is very shallow. An interesting counterexample is the recent rebuilding of a hospital in Chinatown, San Francisco. The initial designs were extremely plain and boxy based on the idea that every bit of money spent on ornament could be spent on life saving devices instead. Only when a foundation was formed to raise money specifically for ornamentation of the building was that added to the design.