Nope. I can and have used my IP address. I host from the computer sitting 1 meter to my left in my apartment. I have for 20+ years. It's just as easy to send http://73.5.160.29/somefunnypic.jpg as http://superkuh.com/somefunnypic.jpg on IRC, or in email, or whatever if it comes to that. Plus there are overlay networks like Tor that I use that do provide end-point identity verification that work great without a centralized domain or CA system.

HTTP/3 would break this.