Your profile completion isn't critical, those are things like birthday, age, all the other stuff that nobody usually shares. Your email account is fundamental to your account, you can't have an account without an associated email address. If your email address is good, you can login and receive email there, then that is the gold standard. Being around 20+ years we've got a lot of old email addresses that people have changed or abandoned. Email providers are revoking bulk senders ability for having too many returned emails, meaning we send emails to accounts that don't exist. That's why we've been on the kick to get email addresses updated.