I'd like to counter, IoT will probably change this view. (however the points raised are still valid.) IoT devices generally have utterly terrible security, and

I'd like to counter, IoT will probably change this view. (however the points raised are still valid.) IoT devices generally have utterly terrible security, and you'll not want them public exposed. I can envisage a place for a house wide firewall of somesort, to stop publicly addressable devices being knocked offline, or exploited by persons unknown. So there will be a need for a "virtual front door" something that home router should really do, but fails utterly in most cases.