Technically interesting, but no thanks. Imagine a Firefox user downloading the latest LibreOffice and being greeted with the warning "Better run through Chrome"

Technically interesting, but no thanks. Imagine a Firefox user downloading the latest LibreOffice and being greeted with the warning "Better run through Chrome", or writing a dashboard on a small embedded system, and the memory footprint goes like 20x because now you need a browser in between in place of native controls. The idea is interesting but there are so many caveats, and the industry is famous for choosing the simplest and cheapest development methods rather than the most efficient ones.