So it's finally happened at least a tiny bit: one of these corporations to which we have decided to dedicate all authority has had a breach. Someday it will be much, much worse. Someday someone will manage to breach and take control of a bigger one in a bigger way, and will instantly gain root on a large subset of the entire computing ecosystem. There's a trend of even delegating things like ssh to systems under OIDC…
What’s your alternative?
It’d be based on keys you control so there’s no way someone could hack some master database or key authority and own the entire universe. That’s a distinct possibility today.
Plausible scenario: high sophisticated nation state sponsored break at Google with cooperation from inside, used to launch a sudden mass malware infection attack against hundreds of millions of systems.