I don’t think it’s the chargers, but the vehicles. Someone correct me if I’m wrong since I’m only familiar with Tesla, but enroute chargers do tend to be super/fast chargers already, and destination chargers really don’t need to be.

A fast charger is theoretically fast enough but vehicles only use its full power for a short time. each vehicle has a curve of the power it can use, where it’s usually not using the full capacity of the charger. I really think we mostly just need improved vehicles, and they have been improving over time