@PhlubbaDubba @tardigrada You still need email for pretty much most services. You need to log in? Create an account using your email and password. Need to work somewhere? A phone number is essential, but the employers will also use your email to message you if you cannot be reached on the phone (happened to me once) or when sending video call invites.

WhatsApp is ubiquitous when it comes to chatting, but for more elaborate communications, email still rules.