why? i personally like the "tear down" aspect effects. often times you have to clean up/unregister things when props change or component is unmounted. this leads to 5 random initializers in component class ctor and 5 random cleanups in onUnmount or whatever it was called. they're separated so its hard to correlate them. but even worse is that you cant encapsulate that by creating your own useX function. you could create HOCs but those were kind of clunky