SSO relies on a security key, rather than a password. For new users with SSO, the initial login process does not require a password.
Changes to a user's password do not impact their ability to SSO into the system. There is no security issue around users with SSO resetting their passwords.
SSO users do see the Change Password link within My Account. Although this may cause initial confusion, any password changes made by SSO users do not impact their ability to SSO into the system. Additionally, users must know their current password in order to successfully change it.