Microsoft getting hacked proves my point more than you think, they're less likely to get hacked now because they have scar tissue. You're basically saying: "If you ever get hacked your reputation is burned forever, but I want these guys who have never done it before to handle logins for me even though they are saying that they are not comfortable with the extra responsibility". Get over yourself.

If you trust your email provider: Ask them to set up an OIDC provider then.

Email is insecure. I can't be the first person to tell you this.

Multiplying your logins is not more security, it's less in the majority of cases.