But a huge reason the situation now is much worse is simply due to the duration of the cold - without power and heat for days there were a ton of second-order effects, primarily burst pipes everywhere. Yet the power system failed very quickly, early on Monday morning. And a huge reason it failed is because none of the recommendations were followed after 2011. And systems that did follow those recommendations (e.g. El Paso, not on Ercot) fared much better.
I have no doubt the historic breadth, severity and length of current cold snap would have caused lots of problems, even if we were well prepared. But on the contrary, I find the misleading ones are the ones claiming this was a "totally unforeseeable" and a "once in a lifetime" event to deflect responsibility for a complete lack of preparation.