Agreed. But art deco goes beyond architecture and was used in other forms. Art deco radios, cars etc. but brutalism doesn't have a form of beauty when done right. It's just not used in other forms. You only see it in architecture. You could argue that the function over form aesthetic of some cars are brutalist, but I'd disagree. Those cars are made out of a purpose of being cheap, which is kind of brutalist adjacent ideology, but not really true in form. No-nonsense isn't the same thing as spartan design due to limited funds/technology.

Tldr: Brutalism gets a bad rap.