In the US, I think it's only the state of New Jersey where self service gas pumps are not allowed.Gas stations are still manually operated in the UK? In the 3 decades I drove an ICE (in Belgium), I’ve never seen a gas station closed because of lack of operators. All of them have a card payment terminal for as long as I can remember. So no advantage for superchargers here.
Edit: so the same observation as @raffiniert in Switzerland.
But I think the larger point is worth reiterating. Every gas station does require a human attendant for safety reasons (at least everywhere I know of in the US). So while a human might not help you with the gas, there will be someone on duty.
And as gas is phased out, it will become cost-prohibitive to keep many stations open 24/7. But a human attendant is never required for a Supercharger. So this is an EV advantage that will eventually become more apparent.