Broadly speaking, electrical grids are the largest machines in the world and are held together by systems to keep everything in harmony at a target frequency (enormous spinning mass that slows when load is added, and has to spin back up, failsafes that have to decouple parts of the grid when maintaining voltage and frequency becomes impossible with committed capacity, etc). It’s actually wild it works flawlessly most of the time and is a testament to robust systems keeping them operational. There’s always room for improvement between here and some nebulous point of diminishing returns. That cost/resiliency discovery process is constant.

In this case, there is room for improvement, at some cost to be determined from a post mortem.