>Really depends on your climate.

Nah, all that determines is whether you need a fallback gas system or not. Even in cold climates, heat pumps can take up a significant chunk of the load on warmer winter days and in the shoulder season.

> The curve changes drastically.

Yes, which is why modern systems can choose whether to run the heat pump or the backup heat based on whichever would be more efficient based on current conditions.

>You can barely get parts for heat pumps just a few years old.

That's not a technological issue. In terms of parts and complexity, heat pumps are literally just air conditioners with a reversing valve, so they're not inherently any more expensive or difficult to fix than an A/C

>I live in New England and it’s just not the way to go. Plus good luck finding an A/C tech out here. Most guys just know oil/propane.

That just means that techs need to keep up with the times.

Similarly, if an area has a bunch of coal plant techs and no wind turbine techs, that's not an argument that the next power plant they build should be coal, it's an argument that they should start to train up some wind turbine techs.