There are lots of non-password-hashing applications of cryptographic hashes, like virtually every authenticity application. Your computer calculated hashes to allow you to post that post on HN.
Although we do want hashing to be slow when it's password hashing, that doesn't mean we want our general-purpose hash primitives themselves to be slow.
Although we do want hashing to be slow when it's password hashing, that doesn't mean we want our general-purpose hash primitives themselves to be slow.