You are correct that many of the brutalist buildings have mechanical systems that don’t function very well today. That is a flaw of the 1960s due to failed attempts at using innovative systems that is not confined to brutalist buildings.

You are also correct that a lot of brutalist buildings are not aesthetically interesting or even architecturally noteworthy. I don’t think many people, even architectural historians, would care much if the average brutalist buildings were razed.

I do wish, however, that you’d have more appreciation and respect for the better brutalist buildings. Rudolph’s A&A at Yale is one of the most exciting, intriguing (and in my opinion, beautiful) buildings of the 20th century. Does it deserve the money that is being put into its renovation? Absolutely. Is it more architecturally significant than the vast majority of the collegiate gothic buildings at Yale? Absolutely. It’s an important part of our architectural and cultural heritage. I

Your assertion that these buildings are simply “monuments to self-importance” is naively dismissive. You could say something similar about any challenging work of art that you don’t particularly care for. Please open your mind to architecture that is beyond the norms of conventional beauty.