The Bolt is in the "awkward middle" compared to the Leaf & the 3. We test drove all 3 and quickly dismissed the Bolt: we'd either buy the cheap car or the best car.
Well sure, but Nissan took shortcuts that I don't think people should live with. Specifically, I am not cool with the lack of battery temperature management in the Leaf. It's basically 'designed' with battery degradation an inevitable outcome for anybody who doesn't live in a mild climate with no serious winters or hot summers. (In other words it's made for California and western Europe.)
No, he's talking about battery cooling, not heating. Cold may make the car not start at all, but the battery should be otherwise unaffected (given adequate protection from the management system, which I think it has).
Heat will destroy the battery. This is why on the previous generation Leaf the battery temperature gauge was so prominent (I haven't seen the latest one).