So I've been in numerous situations where having JavaScript enabled was either undesirable or impossible, granted, it's my own fault for using strange platforms like a Nokia N900 or whatever, with strange web browsers. But it's still nice when interactive websites continue to work even in contexts where JavaScript isn't a thing. I always thought of JavaScript as something you use to "upgrade" the web experience, not to build it. Although obviously there are some things you simply can't do without JavaScript and for which there exists literally no alternative. There's also situations where JavaScript is a liability. See, for example, the Tor browser.
Especially my ideal is that all functionality which can work without JavaScript should work without JavaScript. So, for example, I am not expecting someone to implement drag-and-drop calendars without JS, but there's no reason why the editing function of a calendar item should fundamentally require JS.
That being said, I know this is an idealist position, most companies which work on developing web-applications simply don't care about these niche use-cases where JS isn't an option and as such won't design their web-applications to accommodate those use-cases to save on development costs and time. But, while I am not really a web-developer, whenever I do deal with the web, I usually take a plain-HTML/CSS first approach and add JavaScript later.