[HappMacDonald]

Unfortunately no matter how local you push the CDN: somebody with a crappy connection to their ISP, or a crappy router in their home, or on a tenuous wifi link in their back room or at a coffee shop will drown in the input lag all the same and inexperienced users (those whom this is more likely to happen to) will be the ones to fall into unstable interaction orbits with the UI such as spam clicking the button that doesn't appear to have acknowledged their press.

The real best solution for this one major drawback I am aware of would be for Liveview to be able to generate some JS handling in their front-end widgets, more like Lambdera.

That, and/or run a BEAM on the user's machine via WASM so that they don't have to dirty up their hands in even the slightest amount of javascript lol! xD