If charging were available everywhere a gas station currently exists, vehicle range increases become unnecessarily expensive. The cost of adding battery weight is twofold, the battery cost and the cost of the added weight. Therefore, manufacturers will stop at about 400 miles of range to not add more cost and weight.
Ubiquitous charging is more important right now. When roadtripping, you have to stop and charge when it’s not convenient. Fast charging is great, but it doesn’t charge at a constant rate. Meaning in 15 minutes I can add 150 miles of range. But that requires charging from nearly empty. Since the next charging may be 10-40 miles away, I don’t charge under ideal conditions, increasing road trip time.