I know it was old but any chance I get to vent my hatred for ES5, I take it :D

That comment was from 2 years ago.

Also, it doesn't help that every single entry level programming site (e.g cough Codecademy and FCC) are all still teaching ES5 and treating ES5 as the norm. Even their linter is set to ES5 and will warn you for using ES6 features (e.g =>).

Pre-ES6 JS is garbage though :x

While it's true that's shorter, I'd say for a new JavaScript developer, it's probably a good idea to avoid ES2015 code for a bit. It's not fully supported anywhere unless you transpile it back to ES5, and even then, you have to polyfill much of the changes, and there's no way to polyfill Proxies. This leads to lots of caveats that can get a new developer in trouble.