One of the main problems evidenced in the TX blackout was the reliance on JUST IN TIME natural gas delivery to the power plants.
Unlike coal where the plant may have enough literally on the ground to run the plant for a couple weeks the natural gas plants had ZERO backup storage at their facilities.
So, when the valves froze on the pipeline, they ran out of gas.
They also lost gas compressor stations that had been converted from natural gas-fueled engines to electric motors for regulatory reasons. That’s a problem when the grid goes down.
There were a lot of issues for sure, no single one cause.