[itengelhardt]

IMHO two things:

a) "fast charger" is a loose term and is often used for anything exceeding 20kW. Superchargers deliver up to 140 kW (split between two cars) or 120 kW (to one car). That's why Tesla/Elon sometimes refer to them as "level 4 charger", although the specification ends at level 3. Other manufacturers are now getting on that train with (according to specification) up to 400 kW

b) The notion of the "average electric car user" does not take into account that yes, people drive less than 80km per day on average, BUT they go on the occasional road trip. And they don't want to have a car sitting around just for road trips. They want one that can do both (commute & roadtrip). That's where the supercharger network helps

[rsynnott]

Not sure about the situation in the US. The bulk of the ‘fast chargers’ in the UK, mentioned above, are CHAdeMO (40-60kW, generally, though higher power are coming) and Mennekes (usually 44kW). This isn’t as fast as the Tesla ones, but it’s not 20kW either.