It might be more useful to think of React as having a very simple reactivity system. In essence it just compares state values by referential equality (===) and if they're different, rerenders the component. And that includes children. In order to optimise, you need to both maintain referential equality of objects across renders (i.e. don't recreate them each render) and then tell React to compare the props passed into components by said referential equality before rendering.

Whereas other frameworks have a full blown reactivity system with signals (basically implicit observables), so your state values are not just regular javascript objects but either proxies or some other object which can be tracked by access in components to update things granularly, eg. setting an elements innerText but automatically.