[Capricorn2481]

> For instance, a major selling point of Node was running JS on both the client and server so you can write the code once. It's a pretty shitty client experience if you have to do a network request for each and every validation of user input.

These are two different things and I don't see how they're related. You don't need code sharing to do client side navigation. And you should always be validating on the backend anyway. Nothing is stopping an MPA from validating on the client, whether you can do code sharing or not.