They are not unrelated. As I've always understood it, brutalism was definitely about avoiding artifice, and exposing functional elements. Wikipedia seems to ag

They are not unrelated. As I've always understood it, brutalism was definitely about avoiding artifice, and exposing functional elements. Wikipedia seems to agree. (An encyclopedia is a pretty good place to go for a common starting point when we're talking about what a term like this means!) > Brutalist buildings are characterised by minimalist constructions that showcase the bare building materials and structural elements over decorative design… > New Brutalism is not only an architectural style; it is also a philosophical approach to architectural design, a striving to create simple, honest, and functional buildings that accommodate their purpose, inhabitants, and location. Stylistically, Brutalism is a strict, modernistic design language that has been said to be a reaction to the architecture of the 1940s, much of which was characterised by a retrospective nostalgia.[29] Peter Smithson believed that the core of Brutalism was a reverence for materials, expressed honestly… > A common theme in Brutalist designs is the exposure of the building's inner-workings—ranging from their structure and services to their human use—in the exterior of the building… https://en.wikipedia.org/wiki/Brutalist_architecture https://en.wikipedia.org/wiki/Brutalist_architecture