The authoring tools and the published article don't have to (and I'd argue shouldn't) be joined at the hip like that, though. Obviously the editing tools benefit from being JS heavy. That doesn't justify polluting the published article itself with JS (unless the readers are editing the article themselves? Even then, though; Wikipedia seems to get by just fine without trying to replace half my browser with shitty JavaScript code).

> Just like how Ruby on Rails is slow but we deal with it

Not all of us :)