This is always mentioned, but the term is growing on me. I think we just want websites that are easy to load and read that don’t make a few tabs on chrome take 3GB of memory.
but the word brutalism is just too delicious to let the architects have it for a style they've moved on from based on a building material that's so specific to buildings. It's like modernism, there's always a new modern.
and I'm not joking, I think the word brutalist is so attractive to people that it begs to be recolonized regardless of the narrow context in which it once thrived.
I like your thinking, but there could be confusion if used imprecisely. Namely, people might think it's a website that isn't broken (this could be seen as a benefit for the playfully opinionated), or a website made primarily with functional languages/programming style.
I suppose you'd have to refer to a site as Functionalist.