I think OP meant that he will clearly realize if someone used his email account to reset his password because next time he tries to log in his old password will

I think OP meant that he will clearly realize if someone used his email account to reset his password because next time he tries to log in his old password will no longer work. However with passwordless authentication, someone with access to your email account could issue your account for potentially a long period of time without you noticing. You would still be under the impression that your account is secure.