Think of the chrome browser on Android as another app you are constantly going to compete with in which it's capability is getting more and more absurd until it inevitably covers almost all native capability. It's only a matter of time and seeing how quickly Chrome moves, I'm not surprised.
I think this is fucking great. I was going to learn Xamarin but now I won't have to. That's fucking huge. I've been putting off mobile dev for a while because I found working with Java and Swift clunky. So I waited and waited....and now my dream is coming true. It's pretty amazing that it's Javascript that unites them all. But ES6 is a serious contender...especially that ... operator that expands the JSON objects, it makes working with REST API which almost always involves JSON, it's a heaven to work with. Hell, I shunned ES5 and was actually learning clojure and maybe using Clojurescript with Om, but even though I really love clojure es6 seems like the much perkier option.
I wonder if there's any nice frameworks that can generate some scaffolding and UI kit and stuff for PWA. I'm learning React & Redux but I personally think Vue.js will outpace it...