The article does a shit job of explaining why certain apps are a problem.
These are apps that have not been updated to play nice with iOS 17. And in the case of the biggest offender, Instagram, there are people in Apple forums reporting overheating issues with iOS 17 Instagram for 5 months.
Meta was incompetent. This bug is easy AF to reproduce. I find it hard to believe that no one at IG was running a dev beta or public beta. Every other phone in the valley is running these damn betas. Somehow they did not prioritize compatibility work for the latest yearly major release.
These betas and SDKs are provided 5-6 months before major OS releases. WWDC betas and the final release drop around the same time every year. This is like meta being surprised that Christmas came around at the end of December.