And back in the day it was necessary because there weren't polyfills and there weren't build tools. Nowadays your JS is being run through Typescript or some oth

And back in the day it was necessary because there weren't polyfills and there weren't build tools. Nowadays your JS is being run through Typescript or some other JS bundler and it's converting your code into something every browser can support. If you're still using Lodash or Ramda or whatever it's because the standard library isn't quite as expressive as they are sometimes.