OTOH, these "universal" web apps/sites can work quite well without JS. As long as the developer isn't doing silly things like using <button> as a link, or using an anchor to submit a form.

At one point, I built a sortable filterable table for an admin UI, using React. One of the admins was a "no js" guy, and he thanked me for building the whole thing in functional HTML. Up until that point, I had no idea that the admin side of the system was even usable without JS; that was just a natural consequence of optimizing for SEO and load speed (server side rendering, URL representation for all significant state).

I've been using Internet for almost two years with JS disabled by default.

My experience is, that while ecommerce sites may break, most of them are quite usable even without JS.

Most good blogs work just fine. And the ones that don't I usually don't bother reading.

Far fewer than you'd think, at least among the ecommerce shops I buy stuff from. And those are mostly the huge shops, which are mostly interchangeable as far as I'm concerned.