But... airgapping doesn't stop damages from Aurora type of attacks. So even with top-level grid controls airgapped, if the attacker is at the switch for enough

But... airgapping doesn't stop damages from Aurora type of attacks. So even with top-level grid controls airgapped, if the attacker is at the switch for enough vulnerable lower-level consumers and can synchronize enough switches (car chargers, solar inverters, local substations, etc) the potential damages can still be very significant. As we saw in the Ukraine power grid attacks, you don't even need to go after critical systems. Quantity has its own quality, as the saying goes.