It is a simple case of understanding the exponential growth of EVs.
Some Motorway service stations still have the pair of 50 kW chargers that the Forest Green owner put at these motorway services but they are upgrading all of them to have 8,12,16 or so charging point ie Gridserve are, with their half a billion Private Equity money. TESLA are doing their own thing and have some banks of 8, 12, 16 of their TESLA chargers at various services and now with the version 4 charger non-TESLA owners can charge at these stations with contactless credit/debit card. ZAP MAP shows the rapid installation of new chargers where we are going from 50,000 charging points to 100,000 charging points which will take about another 18 months to do.
It is not a theory about EV drivers knowing which are the "good" service its known by previous visitation and seeing the installs there or being installed and knowing they will be up and running in a few weeks and by checking with onboard or Smart phone Apps which take about 30s to a minute to consult. Apps such as Electroverse from Octopus, onboard Google or Zap Map and A Better Route Planner.
I drive all over the motorway network as my office are Aberdeen, Cambridge, Cardiff, Glasgow, Liverpool, London-Heathrow, Manchester, Tilbury and I visit family from Brighton down to Soho so I must have seen them all, do about 30k miles a year in a mixture of EV and Hybrid, mild and full.
EV drivers I have met at charge points exchange infor while the 10,15, 20 minute charge is going on and point to online publications which highlight the new electric forecourts, services that have just been upgraded, the standout ones like Rugby which is such a good location going East-West or North-South. Also the ways to get cheaper charging using Electroverse RFID card which gives discount on many charger networks and just adds the cost to ones monthly billing so one my not see a cost for months. Happy days.