That doesn't detract from the value of client side validation, which is that it will be faster from the client's perspective and reduce server load.

Yes, but from the end-user perspective, it's nice to not have to do a round-trip to find out that you entered something wrong.

Fair enough.

Still, validating a form client-side doesn't require a JavaScript framework; it would only require the server to send small snippets of JS for each field with the form.