[Eleopteryx]

It's not "completely" silly at all. For "normal" users, it's true that they may never need to do this. It's also a largely "safe" assumption that your site's visitors will have JavaScript enabled.

However there are security concerns when dealing with JavaScript. For example, if you've ever surfed the darknet, disabling JavaScript is highly recommended to avoid present and future exploits that could compromise your anonymity, funds, etc.