"Last week we hosted our latest Netflix JavaScript Talks event at our headquarters in Los Gatos, CA. We gave two talks about our unflinching stance on performance. In our first talk, Steve McGuire shared how we achieved a completely declarative, React-based architecture that’s fast on the devices in your living room. He talked about our architecture principles (no refs, no observation, no mixins or inheritance, immutable state, and top-down rendering) and the techniques we used to hit our tough performance targets. In our second talk, Ben Lesh explained what RxJS is, and why we use and love it. He shared the motivations behind a new version of RxJS and how we built it from the ground up with an eye on performance and debugging."
I don't understand your point. They didn't claim to be first, or best. Just that Edge now supports more ES6 capabilities. Which is a fact. I think we should be glad now that MS seems to be doing the right thing, as opposed to certain other browser manufacturers who seem to have stopped caring.