Before you go off on "lock in", note that native apps have a distinct advantage over any web app using javascript. I hate having 20% cpu use for a stupid chat app on a modern i7 system. Most of that "app" is spinning around chasing its own tail making the cpu fetch memory incessantly and blow through cpu cache/tlb. I don't see that happening with native apps nearly as bad.

Furthermore, you're still running the code on the Javascript VM/interpreter, so it's unlikely to give much of a speed boost. The motivation behind WASM and ASM.js both is to cross-compile code from other non-JS languages (generally, C/C++) into code usable from JS.

Just throwing out a technology doesn't invalidate my point that javascript likely has a lower bound on energy and cpu/cache impact.