You're arguing for the sake of arguing.
Do you really believe that, in domestic environment, someone would supply 3-phase (without a neutral to "... a small outside shed where he charges his e-bike and leaves a battery tender type charger on his motorbike if that makes any difference."?? ... and, in any event, if that were done, how exactly do you think he could be powering these battery chargers without a neutral??
Your suggestion is a lot more 'unlikely' than the 'unlikely' comment of mine which you are quibbling about.