This is all missing the forest for the trees. The astronomical bills are just the salt in the wound, but the main wound is that many millions were without power. This has caused a lot of suffering, dozens of deaths, and a huge amount of damage to physical property.
If Texas hadn't isolated their grid in an effort to shirk federal regulation, FERC's 2011's 'recommendations' could have carried the weight of actual regulatory enforcement and the fines that come with that. Instead, ERCOT more or less ignored all of FERC's "hey maybe you should winterize your stuff so this doesn't happen again!" report, and then it happened again.