It would be great if you could log into your plex.tv account using a passkey (Passkeys (Passkey Authentication)) as opposed to an email & password.
In contrast to passwords, passkeys are virtually unphishable, easy to use, and highly secure by default - and there’s no need for a second authentication step like TOTP. They are being pushed by Microsoft, Apple, and Google (you can even sign into your Google account using a passkey: Google Online Security Blog: So long passwords, thanks for all the phish) and will, slowly but surely, replace passwords for the majority of online services.
For a service that can permit access to (and deletion of) private content, this seems like a good security step to take sooner rather than later.