Tesla are supposedly opening up their network soon, but that's not really the issue. Cars have a limit on how fast they can charge, and for a lot of more economic cars that's often quite slow.
The 2022 Nissan LEAF 40kW (149 mile) model can only charge at 50kW, the 60kW (226 mile) model pushes that to 100kW. The marketing says that's 45 minutes to 80% capacity. The 2022 Chevy Bolt is similar. If you are just commuting to and from work, then these cars are fine, but for a long trip you definately want an EV that can charge faster.
Sure, but a car isn’t the only thing you could potentially plug into a Supercharger. (That’s why I said “the device on the other end” rather than “the vehicle on the other end.”)
Maybe you just want to charge the gigantic custom-built battery bank you use for accessories power in your RV! Or maybe one that’s just a hacked Tesla Powerwall or five. (That’d be the “white-hat” use-case.)
Or perhaps a portable (towable) hydrogen generator, to fill bottles for hydrogen-powered cars. Still an “adapter”, technically, though doing it at the substation-level rather than the near-power-generation HVDC level is probably horribly inefficient and wasteful.
Or perhaps a mobile Bitcoin mining rig consisting of server racks installed in a air-conditioned shipping container on the back of a semi-truck…
Or the lighting and sound for a pop-up roadside rave event!
The 2022 Nissan LEAF 40kW (149 mile) model can only charge at 50kW, the 60kW (226 mile) model pushes that to 100kW. The marketing says that's 45 minutes to 80% capacity. The 2022 Chevy Bolt is similar. If you are just commuting to and from work, then these cars are fine, but for a long trip you definately want an EV that can charge faster.