The article doesn’t go into it, but a key advantage they have is that heat pumps move heat, rather then trying to generate it. So they can move a lot more heat into your house than would be generated by running the electricity they use through a resistor. This makes them effectively more than 100% efficient (the exact amount depends on temperature) as compared with burning a fuel or resistive heat.
Heat pumps can run in very cold weather; and the worst that may happen is that you need some additional resistive heat to handle the demand. You don’t need a completely new system to supplement heat with current technology.
And a heat pump is an air conditioner that moves heat both ways. A lot of heat pumps today operate in dual mode, so they can act as air conditioners as well
Straight up since my grandma got one installed at her house she hasn’t had to use her in wall heaters or her fireplace
And in AC mode that thing is great