The report in particular said that 67% of the lost capacity was directly attributable to cold weather, specifically frozen sensing lines, frozen water pipes, windmill blade icing, etc. A remaining 12% of the shortfall was secondarily caused by the weather, specifically plants running low on fuel. This leaves a remaining 21% for “other”, which presumably includes downed lines. I wouldn’t call that the “major” problem, not compared to the 67% caused by the plants freezing.
https://www.powermag.com/ferc-nerc-february-blackouts-in-the...
As far as 1989 being 30 years ago: it’s still within living memory. It’s not like we’re talking about the 1899 freeze or whatever, lots of people in Texas remember it! So far Texas has had power issues due to the cold in 1989, 2011, and 2021. I think by the point you’re having this every 10-20 years, it’s time to start planning for it, no?