It’s not just about reserve capacity, ERCOT was warned about insufficient winterization after the last power grid failure due to cold weather, they just didn’t act on it. Should the Texas government have mandated improvements at that time? Absolutely. Do I still believe that ERCOT has at least some blood on their hands because they knew about the problem and chose not to fix it despite the hardship it could cause their customer base? Absolutely.
Also I have seen the practical engineering video, love that guy.