We warn developer to not reinvent the wheel. They should use the external libraries that WordPress has already.

As we say in the review:

Including Libraries Already In Core

Your plugin has included a copy of a library that WordPress already includes.

WordPress includes a number of useful libraries, such as jQuery, Atom Lib, SimplePie, PHPMailer, PHPass, and more. For security and stability reasons, plugins may not include those libraries in their own code, but instead must use the versions of those libraries packaged with WordPress.

You can see the list of JS Libraries here:

https://developer.wordpress.org/reference/functions/wp_enqueue_script/#default-scripts-and-js-libraries-included-and-registered-by-wordpress

While we do not YET have a decent public facing page to list all these libraries, we do have a list here:

https://meta.trac.wordpress.org/browser/sites/trunk/api.wordpress.org/public_html/core/credits/wp-59.php#L739

It’s fine to locally include add-ons not in core, but please ONLY add those additional files. For example, you do not need the entire jquery UI library for one file. If your code doesn't work with the built-in versions of jQuery, it's most likely a noConflict issue.