We had lots of convenient user interfaces on the web without JS. "The most simple things" absolutely do not require it. Simple things can be done in pure HTML.

We had lots of convenient user interfaces on the web without JS. "The most simple things" absolutely do not require it. Simple things can be done in pure HTML. That's what the web has always fundamentally been about. You should TRY building a site without JS. Just try it! You'll be amazed.