Just a guess with no evidence, but I think a core premise of the FP movement was that mutability was the source of all of our problems. And what Rust has shown

Just a guess with no evidence, but I think a core premise of the FP movement was that mutability was the source of all of our problems. And what Rust has shown is that maybe mutability was fine along, and it was more specifically "mutability + aliasing" that was the source of all of our problems.