Yes, Babel has polyfills, but not everyone wants to create complex build systems and may just want to stay a little more basic. Saying that a polyfill package is useless just because Babel can provide it is a poor argument. Packages aren't useless just because other tools can provide the same thing. It comes down to developer preference on whether they want to use Babel or whether they want to be simpler.
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Babel has polyfills, so you don't need to write old JS or use outdated packages to support old browsers.
Yes, Babel has polyfills, but not everyone wants to create complex build systems and may just want to stay a little more basic. Saying that a polyfill package is useless just because Babel can provide it is a poor argument. Packages aren't useless just because other tools can provide the same thing. It comes down to developer preference on whether they want to use Babel or whether they want to be simpler.