When relying solely on passwordless magic links for signing users in to your application, you make the timely delivery of these links to people's inboxes a critical dependency for using your app. Though unlikely, it's not impossible that a mail service provider experiences an outage blocking your users for logging in. Less dramatic, but equally likely, your application might get throttled which could cause these login emails to arrive after the included links have already expired. What are your thoughts on this?