Hmm, not really sure I'd say at some of these locations that a Fast charger is quick enough.
I'm rarely at a grocery store more than an hour at absolute most which would give me around 7kWh at best. Typically I'm closer to half the time though.
If I then take 4kWh that's just about enough to cover the trip to and from the store for me.
But at the same time at a grocery store 50kW gives me around 20kWh in the same time making it worth it.