I don't see how this is "full circle". In places where it does get that cold, most homes already have a form of heating for the house. Adding on a heat pump or, at least in my case in the Midwest, replacing the central AC unit with a heat pump just means that you're only kicking that original heating system on a few days out of the year. That's a massive reduction in use compared to being the only source of heat for half the year.

It's a problem that new construction homes would need to fix if they don't want an NG connection at all, but it's not unsolvable.

You'd usually run two or more units in a cascade/multiplex when requiring large amounts of power rather than having one giant unit. Means you can turn off one or more units entirely for low heating demand.

I think modern inverter units are not less efficient when oversized. They are able to run at varying levels rather than cycling.

Those "heating strips" are only used a few weeks every year in my case.

The optimal solution is to add a small heatpump in addition to a gas heating