Sort of. But, was the problem the principle or the execution? Those "solutions" pre-dated the idea of building robust apps with native Web-idioms (e.g. SPAs). So, they tried to layer on an entirely different non-Web platform, including a completely new, non-browser native UI framework.

And, we're now delivering entire frameworks to the browser to support, essentially, a kludgy VM-based approach that just shoehorns app concepts onto the HTML document model.

So, what I'm suggesting is more of an in-browser hybrid.

Assuming the only two approaches are Flash or React seems like an industry-wide failure of imagination.