Charging stations, besides providing sufficient power to max out the inbuilt charger, have no effect on the time it takes to charge current EVs.
The charger and battery management system are currently always in the car. The charging station is just a power outlet with an energy counter.
Whilst it's true that most available cars[1] have an upper charging limit well below the common charging station max of 250kW, not all charging stations are created equal.
There's a lot of smaller charging points that have to be small because the grid can't supply 250kW so you only get 50kW or 9kW.
Even if you do have the grid capacity to supply a few high current points you might be able to double the number with localised energy storage. Flattening that peak demand when all points start charging the same time.
Right now there's a lot of contention and queuing for those high capacity stations at certain times of day.
As long as the cost of an energy storage system, regardless of how it works, is lower than the cost of expanding the grid locally it's a viable option.
1. e.g. Audi eTron can only charge at a max of 150kW and the rate drops off as the battery fills.