It should be kept in mind that some features from ES2015+ are not transpiled by Babel. Array.prototype.includes and Map should be explicitly polyfilled if it's necessary to support older browsers (IE, for example).
Yes, I agree. But also, we should slowly stop caring about the IE and it needs. If we do that, we have solid cross-browser support.
We're a place where coders share, stay up-to-date and grow their careers.
We strive for transparency and don't collect excess data.