That works, but EV chargers are rare enough that you can't just see the charge meter getting to low and get off at the next exit for a fill up like you can with a gas charge. If you don't pay attention you can end up with not enough charge make it to any charging station. People run out of gas too, but most cars the gas light comes at with 40 miles of range left - 40 miles of range won't always get you to any EV charger (and with different charging standards you cannot be sure your car can charge at them all though this is getting better and will likely be solved in a few years as we move to NACS).