There are more divided highways than interstates. There are US highways like US-101 or states ones like CA-99. Also, all of the US and state highways are called highways, at least when not in towns, not just divided ones.
There are areas of the west that have enough coverage for driving through but not for trips. You would be pushing it visiting the Wallowa Mountains in Oregon cause La Grande or Joseph only have slow chargers. Another is the "Loneliest Road in America", US-50 in Nevada, has 285 mile gap.
> There are US highways like US-101 or states ones like CA-99.
Neither of which has anything but a vanishing fraction of areas more than 100 miles from a supercharger.
Your other examples are real, though pretty spun. It's true! There are a handful of remote[1] areas[2] where EVs are still going to be... well, "less convenient" than a gas car. You can absolutely visit the Wallowas or transit Nevada in your Tesla, and people do.
Claiming "The USA is really big and has a lot of uninhabited desert" as evidence for corporate mismanagement of Tesla is... really weird, honestly.
[1] Just checked: the Pendleton charger to Wallowa Lake is 110 miles. So... not really "pushing it" except in a SR model 3.
[2] They didn't name it "loneliest" because of EVs!
There are areas of the west that have enough coverage for driving through but not for trips. You would be pushing it visiting the Wallowa Mountains in Oregon cause La Grande or Joseph only have slow chargers. Another is the "Loneliest Road in America", US-50 in Nevada, has 285 mile gap.