I think that the EU needs a sub-second electricity market or another mechanism to make it profitable for companies and individuals to stabilize the grid.

We will soon reach a point where the mass of spinning electric motors that are directly connected to the grid via three-phase power is so small, in comparison to the decoupled load, that I somewhat believe it will destabilize the grid.

Normally, the motor mass works like a gigantic capacitor that gives the entire grid a large amount of inertia. That inertia allows the system to handle even the sudden disconnection of an entire nuclear plant gracefully. But this effect will fade as more and more systems become decoupled.Every synchronous 3 phase generator is grid-forming, and any synchronous 3 phase motor adds inertia and helps stabilize grid frequency. However, this effect is becoming less relevant as their share of total generated and consumed power continues to decline.Solar panels and other inverter-based systems must include an systems [1] that will regulate the injection of power relative to the grid frequency and voltage but they follow the grid and cannot counteract sudden loses of power.For that we need batteries that are able to pump a lot of energy into the grid in a short span of time.Normaly these thigs are gigantic MW systems but this will turn our grid into a more centralized and fragile one.What we need is a grid that is decentralized, self building and robust.Every electric car and wall box should help to stabilize and build the grid so we become anti fragile against war and catastrophese.

[1]  https://en.wikipedia.org/wiki/Droop_speed_control