The original sin wasn't reactivity. It was putting state in the wrong place. Making the client state heavy. It's been downhill since then. Now you need to dupli

The original sin wasn't reactivity. It was putting state in the wrong place. Making the client state heavy. It's been downhill since then. Now you need to duplicate state handling between your frontend language and your backend language. Which leads to "isomorphic" backends seeming like a good idea.