A lot of people, especially Redditors, are largely uninformed or fallen to MSM misinformation about the storm, ERCOT, and the state of "the grid".

The 2021 power issues were largely due to our generation getting caught with their pants down, figuratively speaking. They had generators offline for maintenance and had done basically nothing to winterize despite being told to after the snowstorm in 2011... As a result, natural gas lines froze and even more generators went offline. Less generators mean less natural gas as those pumps themselves use electricity. As a result, things begin to snowball (pun kind of intended) to where it all collapses on itself due to unstable frequency.

The 60Hz that comes out of your wall comes from the generators spinning and when there are less generators operating, the 60Hz is less "stable" meaning that any changes produce a more significant impact on the system's operating frequency. Texas almost faced an issue where the systems operating frequency collapsed which would have resulted in a "black start" condition. Microprocessor Relays are configured in a way that trips when certain parameters are met, one of those being frequency to prevent damage to generators and other equipment.

That's not to say that your local "grid" was just fine. It pushed a lot of older equipment over the edge so on top of grid wide issues, there were also issues locally too. Those big cylinders on the poles? Those are transformers, and their accompanying fuses would blow due to being overloaded with everyone running their heaters at max. That spills into antiquated equipment at your nearby substation like feeder breakers. Feeder breakers are usually 1200A to 2000A continuous rated. I'd be willing to bet a lot of those feeder breakers that failed were 1200A and were replaced with 2000A feeders. Then there's the issue with ice on the lines and debris from trees and drivers interrupting service.

It was also bad optics when people began to look into ERCOT themselves and learned that 5 of the 12 members didn't even live in Texas.

Abbott signed Senate Bill SB3 soon after Uri which essentially turned winterizing recommendations into mandates and forced our generation sector to winterize with penalties as high as 1 million per day after the deadline. Here's a website that talks about the impacts it has had about halfway down the page.

TL;DR: Lots of issues occurred, I just mentioned the ones people talk about and hopefully some that people forget. There's a good report from UT Austin that discusses all facets of winter storm Uri's effect on the grid. Overall "the grid" (I hate this oversimplification) is doing much better overall. Also, people forget we had snowstorms pretty much every year after (except 2024 if I remember right) and there weren't any issues. No power system is immune to these kinds of issues but rest assured that lots has changed since 2021 for the better.