> I can't remember the last time I created a website in a professional setting that would work without JS.

A website which does not work without JavaScript is by definition unprofessional. That doesn't apply to web applications, which of course use JavaScript heavily, and need to (at least until WebAssembly is ready for prime time — and even then JavaScript is required as a shim).

The Web is a web of hyper-linked pages, documents. It does not require JavaScript, although of course many pages are improved with the dynamic behaviour enabled by JavaScript.