Load management over the whole system is going to be needed as well, so CT limiting and central reporting/control will, I suspect, become a requirement for any fast charger.So this setup is going to be needed more and more often as we approach 2030.
Basically you can have 100+ houses on a 500kVA substation as the normal usage patterns (diversity of load use) means it is not overloaded for any significant time. But the old 'normal' did not include several 7kVA chargers (or more) running for many hours simultaneously on half of the properties!