I wonder what the reasoning was behind branding the author in the URL path as opposed to as a subdomain. It seems like a very strange approach to take from guys

I wonder what the reasoning was behind branding the author in the URL path as opposed to as a subdomain. It seems like a very strange approach to take from guys who have done the latter before. If nothing else it sure makes posts from Medium very annoying on HN because I can't actually tell which blogger's post I'm going to read until I click the link (primarily read on iPad so no hovering).