That's a straw man argument - I did not say it's concern #1, just pointing out that React forces that specific trade-off. Balancing complexity, maintainability,

That's a straw man argument - I did not say it's concern #1, just pointing out that React forces that specific trade-off. Balancing complexity, maintainability, AND performance is really hard with hooks, the lack of built-in reactivity and inefficient baseline behaviour. It's rarely a matter of "just combine it into one reducer". On top of that, profiling and optimizing a real world application with a dozen hooks in every component is pretty painful.