Lots of people consider only their commute
No they don’t.
The frequency of 200+ mile trips is vastly overestimated by anti-EV people
The frequency is irrelevant. Again, if you want to go on a single trip, literally ever, in the entire time you ever own that vehicle, it needs to be able to make that trip, and it needs to be able to do it in a reasonable about of time.
A half-dead 2011 Leaf would still cover my 40-mile round trip.
If you only ever drive back and forth to work, then I feel really really sorry for you, but you are an extreme minority in that sense.
the ICE generates an insane amount of excess waste heat as a byproduct, so you have a virtually unlimited supply. The Volt is a PHEV so resistive heating was probably not considered super important.
There’s no if about it, it is ~300% more efficient.
They are the same issue. Less energy used for heating = more range.