But yes, grid following alone does not provided the required stability - synthetic inertia etc needed
With enough voltage range that wouldn't even need the tricky loops of voltage regulation common in incandescent-targeted legacy AC grids.
It looked to me that regulators wanted to make solar the scapegoat for political reasons.
The report indicates to me that different operators were using a random monkey theory to make changes until the grid stabilised (they clearly didn't have a handle on the root cause of the instabilities). The regulator screwed up: they are supposed to engineer the network so it can be stable (even in the face of political pressure).
