centralizing as in when you setState({ a: true }), you also think "wait a minute is having a `state.b` still makes sense, now that "a" is `true`", maybe it shou

centralizing as in when you setState({ a: true }), you also think "wait a minute is having a `state.b` still makes sense, now that "a" is `true`", maybe it should be setState({ a: true, b: null }) > It's not mutable during the render function I don't think that's the point at all when people talk about mutability. To me mutability is just a proxy for "lacking access control", which again goes back to the point about centralizing state updates. So arguing about the technicality of what is mutable and what is not is pointless.