[Groxx]

A provider changing their URL: totally agree, huge problem. But that's on the same scale as your email provider changing their URL. Problematic and rare. And it's something nothing can adequately deal with - your "forgot password" links won't work if your email changes domain names. It's also an abnormality that can't be securely accounted for, because otherwise MITMs could just hijack requests and send it to their own servers with no complaints.