It might be optimal compared to other SSO options (I doubt it, but maybe it is for Cryptee), but it’s not better than using a password manager and being good about using single-site passwords, that’s all I’m saying.
So if you’re looking for convenience,[1] a password manager is the same amount of clicks as doing a “Sign in with…” SSO account 
↩︎i was surprised to learn that google’s single sign on was a good thing, and wouldn’t mind using it for its convenience.