sshfp is not PKI. It's an option and it is off by default in ssh(1). In practice no one actually deploys it, exe.dev, terminal.shop, jobs.{whoever.com}, etc. I've yet to see an in the wild deployment. The aforementioned sites let you perform electronic payment transactions over ssh without it, which is probably a PCI violation tbh, but auditors aren't good enough.

webpki is on by default.