If you read just a smidge of the context, it's a sizing issue, not a capability issue.

63 when it’s -5 out seems totally fine. More than fine for much of the US.

Maybe totally fine for you. But that will not be "totally fine" for much of the US when they are expecting to keep their house at 72 degrees and the new technology they got talked into can't do it.

The tech has limits and cold weather states can't avoid that or the reputation will get really bad and the tech will fail.

I'm not sure if you've lived in prolonged -15F areas, but many conventional heating systems struggle too... especially in poorly insulated houses. People often have wood stoves or other ways to compensate.

ok, Reddit is not representative. what qualifies you to speak for what customers will accept?

I spent 5 years installing and maintaining A/C equipment for residences and a few small commercial locations.

and if you believe that heat pumps do not work below freezing temperatures, you are part of the reason why misinformation keeps spreading. You should know better. You should be ashamed to be spreading straight up lies.