I also think it's worth noting that fat arrow class methods is not a feature of JavaScript/ECMAScript, but rather a feature of Babel. It might make it into a f

I also think it's worth noting that fat arrow class methods is not a feature of JavaScript/ECMAScript, but rather a feature of Babel. It might make it into a future standard, but so might decorators (including autobinding decorators) or double-colon syntax for binding. None of these is currently legal vanilla JS.