It's likely many early adopters have chosen to do so because they were able to charge privately. Using public chargers for longer distance driving.
A look on zap-map along my commute route (35 miles) there are 2 public chargers. A lidl pod point at one end (currently reported not working) and a shell recharge the other which is out of order. Everything else is a significant detour, and questionable if they are public, I'm fairly certain that DPD Chelmsford won't let me in their depot. If I didn't have a driveway and a generous workplace the other end I wouldn't have been so confident in purchasing at this time.
Then it's all a bit chicken and egg, we'll install more chargers when there's enough EV demand, I'll buy an EV when there's enough chargers.