I think you’re missing the point. When a part of the grid goes down in another state, it doesn’t take the whole system with it, because it’s connected to a larger grid. Not so in most of Texas.

West Texas is connected to a larger grid, unlike the rest of the state. It didn’t have any problems with snowpocalypse and electricity.

https://www.texasmonthly.com/news-politics/el-paso-electric-winter-storm-2021/