Why do you say that? My email provider (fastmail) supports two-factor auth. Beyond that, I use a long password generated by my password manager. Why am I less secure than a Gmail user?
I think security is much more dependent on user configuration. If my password is "passw0rd" then I'll be fairly insecure regardless of my provider. Likewise, since I have 2FA set up, I'm better off, regardless of provider.