In power grids the system must be able to handle peak loads for weeks at a time. Either it will shed loads (aka shut off electricity) or things will explode. A black start cannot be allowed to happen as it would be catastrophic
Peaks don't last for weeks, but yes: Load must sometimes be shed.
That happens today. It will happen tomorrow. It's imperfect. This imperfect nature doesn't mean that progress must cease, or that all things must be forever maximalized in search of perfection.
The system we have now is imperfect. The system we will have in 10 or 20 or 100 years surely will be imperfect, as well.
We must not let perfect be the enemy of good: If we do, then we'll never get anything done at all.