It depends on the site. Some sites which leverage javascripts are still usable without the scripts. And there is a spectrum of usability. Lemmy is a good example. Most lemmy instances which are open to the public (without captchas or login) are generally usable without javascripts. Some features don’t work, but knowing the path to the page allows manually getting there without javascript buttons. So like, adding /?sort=TopHour to the end of a lemmy instance’s url sets the sorting for the page to top posts in the past hour. However, some other features don’t seem to work at all. But then there are lemmy instances which utilize mlmym, which basically replicates old reddit and works 100% without javascripts. And then there are instances like mbin, which is designed to be a modern fediverse experience which does not require any javascripts, and it works very well.

When I load a site, any site, if I get a blank page or a bunch of placeholders for javascript elements, I just close the tab and move on. Sometimes if I’m curious, I’ll switch from “Basic Page Style” to “No Style” (Alt+V Y N) to see if there’s anything hidden beneath the surface.