Based on my firsthand experience, cold weather (big one) or hauling/towing significantly reduces that 400 mile range (sometimes by 50%+). Yes to comfortably get 400-500 miles per charge in the worst case scenario it needs to be atleast 2x.
More like, more people should understand how EVs can easily work for them, and then try to shoehorn gas-powered vehicles into the few niche they need to be in.
How often does someone need a 400 mile range again? Towing? When is the last time you towed something 400 miles? The most I ever towed was... using a rental truck and a rental trailer when I moved. (Anecdotes are not data!) But why in a rational purchasing decision would I need an 800 mile EV battery for a car just because sometimes it's cold out?
So yes, you want 400-500 miles of range, but that's because you've doubled the 250 for weather, safety margin, etc.
I want to drive for 4 hours and then stop for 20 minutes. So >250 miles of 70mph range between 10-80% charge.