I think my subjective feeling is in that ballpark, yes. There are of course many sites that are more like web apps that require js, but those are relatively trusted, I added exceptions for them long ago. For sites that I visit for the first time, I think more than half still work to some extent. Maybe they are slightly broken, but at least I can read the page. I’d say around 20–30% of the web even gets _better_, because you don’t get ads or cookiewalls. But then there are also many sites that just remain a blank page, not even showing a message that js is required. (And as the sibling comment points out, recently Anubis is also becoming more common; maybe in recent months it’s closer to 40–50% unusable.) When I hit that, often I am reminded that I wasn’t that interested anyway, and I close the tab. So maybe it’s more than 30% that breaks, and a more accurate statement would be “of the sites where I ended up reading a page, I had to opt in to js about 30% of the time”.