> an average person having one username and password/authentication method that works across all services It's a bug, not a feature. It's people throwing away their privacy for convenience. It's proverbial dancing piggies. Problem with global-scale SSO is not corporations, that control shared identity. It's shared identity itself. Distributed SSO is as good idea, as eco-friendly vegan huffing solvent.
SSO outside of such closed realms, i.e. in the open Internet, rather only seems to be a "problem" because people don't want to adopt it. Instead, password managers are the solution that won. The Twitter thread mentions "No sweat: you can have as many Eth accounts as you want w/ different ENS names", but if you end up having one (or more, see throwaway accounts on Hacker News) accounts for each site anyway, why go through the trouble with public/private keys, when the random shared secret in your Password Manager works so well?