I understand react is not easy for some, and this article is made for those who are finding a hard time with it. "Adjusting state when prop changes" only means

I understand react is not easy for some, and this article is made for those who are finding a hard time with it. "Adjusting state when prop changes" only means your dataflow is a whack and your logic is a mess, and article explains it well. I have shipped quite a few React interfaces to production and never in my life I had to adjust the state when prop changes, this even sounds like nonsense and smells of bad react code. StrictMode mounts components twice specifically to find bugs where an effect is lacking a clean-up, good react UI means an effect can be ran 100 times with the same effect, and StrictMode helps to ensure that. >Dan Abramov subsequently tweeted to not rely on the empty dependencies array as a guarantee that the useEffect only fires once per component's lifetime It is very strange that you can't find online such a non-sensical tweet from Dan, because in case of effect there is no component, and it's lifetime is non-existent, there is only function, and it can be called, and it might call a side-effect or not in it's execution, depending on X or nothing. He was probably explaining that a useEffect is not equal to a lifecycle method componentDidMount – and empty dependencies mean actual side-effect of your render function without dependencies, which you still need to clean-up properly – not the shortcut to the old "component lifecycle". After 2019 the whole concept of "mounting" and "unmounting" the "component" was obsoleted and replaced with just a function and it's side-effect, which was a dramatic shift towards procedural and functional react which does work at scale from the class-based lifecycle concept which failed at scale. For some people it is harder to grasp something procedural and functional, especially if they are used to think inside some other concept or paradigm, they mess up their one-way data flow, immutability, function composition and end up in pain using react, and it can be hated for that, i agree.