Oh, wow. That is a frightening level of protocol ossification.
IMHO, the original spec had it right when it said (paraphrased) “just upload your tw.txt
file wherever”. The essence of micro-blogging, as opposed to full-scale blogging, is low friction and low stakes. Imposing a norm that you can’t just use any ol’ url, looking down on people with insufficently cool urls (as in “Cool URIs don’t change” https://www.w3.org/Provider/Style/URI), puts up too much of a barrier to entry.
Also seen: an eyeless freak of indeterminate species. Swims in the pond and has long toes, like a duck, but lacks toe-webbings (and eyes), unlike a duck.
Say no to cordless peripherals! Real mice have tails! (I just like not having to charge and/or swap out batteries all the time)