Just a couple of comments on your post. I ran a comparison of a $50,000 car loan at 4% versus 8% over 60 months. Monthly payments are $93 higher at 8% (which might be totally offset by gas savings for someone switching from an ICE vehicle). The real kicker is total interest cost over 60 months; $5600 more at 8%.
Regarding heat pumps, I have mixed feelings based on our location (BC Interior), patterns of usage and experience with our 2018 Model 3 (no heat pump). Loss of range in cold weather can be a real issue and may require extra charging stops on longer trips. But compared to 2018, charger availability is so much better now and will only improve over time. (We tend to make far fewer out-of-town trips in the winter versus the summer.) Our ID.4 came with a heat pump which I prefer but might have purchased without a heat pump. Waiting for a VW with a heat pump (or waiting for another brand) introduced a lot of other uncertainty into the financial picture for us; would out trade-in value fall, would gov't rebates get reduced, would Cdn pricing increase to match US prices, etc. We're happy with our decision to buy 2 months ago.