I really, really, don't get the whole "implement everything using web technologies" thing. As an outsider from that dev ecosystem it looks like the youtube videos you see of people implementing electronic circuits in Minecraft.
It makes more sense (to me) than "implement everything in a monospace text-based terminal you can't resize, hacking around years of horrible different methods of repositioning cursor / changing colour / setting title".
Of course, one could just write a native interface for every OS, but then that adds a new layer of complexity. HTML & Javascript engines are nowadays well optimised and available everywhere, making them the only real choice as a replacement for terminals.
