I think a contributing factor is because it’s an EV and not an ICE ?.
With a ICE model there is a lot of residue heat being absorbed by the medal bodyshell, this is supplied by heat from the exhaust system and the ICE unit itself.
The lower floor pan in a EV has no help in this regard and therefore it takes a lot longer to warm up to lower section of the car, as heat rises of course.
The electric heater in a EV has to work really hard and it acts a little like an electric heater in the home.
As soon as you turn off the heat source, the heat loss can be felt instantly.
Today we made a short trip of about 30 minutes in the car.
We had the heater on constantly.
When we stopped, I opened the sliding panel where the cup holders are located.
When I put my hand inside of the cup holder, it was absolutely freezing ?!.
Getting the whole cabin warm takes a long time and of course demands a lot of power in the process.
If you use the recirc button, it will heat up the cabin faster, because you are not heating the cold air pulled in from outside.
However, you will have to closely monitor the misting up of the glass.
As soon as it starts, release the recirc button.