Put differently, if we react has to build an object tree, and then diff it against another object tree in order to know what to update, then targeted updates aren’t really on the table. And reactive types like signals really don’t have any direct advantage for react.
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We do that in preact-signals
Briefly wrote about the difference to hooks https://jovidecroock.com/blog/signals
For a React component that only has targeted updates it turns the function into a setup like Solid, but without the nice syntax for computeds.