I agree with this. The people saying it's technically possible to get a different webpage at that resource address are missing the point - it's trivial to do A/

I agree with this. The people saying it's technically possible to get a different webpage at that resource address are missing the point - it's trivial to do A/B with the same site, same port, same protocol, based on user IP, time of day or a RNG. The point of URL is to identify a single address owned by one guy. Removing the www subdomain means you have two addresses, possibly owned by two guys.