There's no problem with it, but its 2 main use cases are gone: ensuring a consistent idiom between various browsers, and providing a nicer API. Vanilla js does

There's no problem with it, but its 2 main use cases are gone: ensuring a consistent idiom between various browsers, and providing a nicer API. Vanilla js does both now (if you really want to support older non-IE browsers, you can add a transpiling step). There's one use case that might remain: the jquery plugins ecosystem. You can find many replacements on npm, but they're a bit less beginner-friendly.