What the heck are you talking about?

Don't you realize that the smaller the grid, the more important the instantaneous load variations can be in relative term and the harder it is to keep things running smoothly? It's not a theoretical concern, it's why electric networks on islands are much harder to work with and much more prone to collapse than bigger networks.

I think the point I am trying to make is that the risk for big area outtakes are lower with more figurative islands.

It is not. The bigger the network, the more stable it is, that's why countries keep interconnecting with each other despite political tensions between them (no pun intended).