A fast charging station that is working, that has the correct connector for your car (including adapters you carry), that your car will work with (Tesla hasn't opened their superchargers to call cars with the NACS connector), that you have an account with... There are too many things that just are not there.

One top of that you need to find a charger. They are all over, but many of them are slow speed chargers. There are also a lot of gaps, if you pass a charger with 50% battery remaining you can't be sure you will make the next one. (most cars can pass several gas station with 5% gas in the tank and still make it to one). You need to ensure you will get back to your car when it is charged so they don't charge extra (this is a problem if you are at a concert or something and are trying to charge while doing something else that can't be interupted)

Someday all the above will be fixed. Everyone agrees NACS is the future connector, but it isn't rolled out. Someday every "gas station" will have a charger with the gas pumps (or perhaps something else?) - at least along routes where people often make long trips. Someday you won't need a phone/account, just swipe a card - or so I hope. But someday isn't today.