Sure, I didn't say "useless". The post I was responding to was worded in such a way as if FP was the only suitable paradigm everybody should be using. FP is a n

Sure, I didn't say "useless". The post I was responding to was worded in such a way as if FP was the only suitable paradigm everybody should be using. FP is a nice and useful abstraction, but in some areas it is just too inefficient and despite all the great compiler progress of the last decade, it is still not there yet. FP languages are not in the same problem domain as system programming languages, so claiming FP should replace Rust is just ridiculous (and as a side note: Rust borrows many things from Haskell/Scala as well, so some FP is there).