You'd be surprised how many new websites out there are still made by importing JS from a random CDN, no version control of course, code is uploaded manually through FTP

I think we should be amazed at how far amateurs can go :)

In a world where all websites have to be perfect, we would have far fewer websites.

During code review we just discovered that a somewhat popular npm library used a CDN for its assets (images of flags corresponding to country iso codes), forcing us to reimplement without the library.

We need another new competing module system to screw up all the CDNS!

What does Wordpress do ?

I think this is like asking "What would Jesus do?", but with a worse role-model.

The problem with WordPress is a lot bigger with the Themes/Plugins than with the platform itself.