So frequently do I see the hottest new ECMAScript feature presented by one these folks on Twitter, and I'm thinking how out of the box, older browsers won't sup

So frequently do I see the hottest new ECMAScript feature presented by one these folks on Twitter, and I'm thinking how out of the box, older browsers won't support it, and most junior developers don't have a great grasp on polyfills or transpilers. So the first thing I'm seeing is limitations in how I might use it in a production environment (or the small but non-zero work to update my tooling to properly support ES5), but most of these folks don't seem to develop in environments requiring older browser support, but in either case, the nuance always seems missed. It's a caricature of the depth that we sometimes need to dig into.