Excuse my ignorance, but was not it already easy to do these operations? Seems like yet another centralized package repository with a supposedly visually appealing interface, where this interface is done just a little bit differently.
Edit: apparently it is not a package repository, my bad.
Could someone please explain to me what exactly it is and its use cases? Is this supposed to replace some of the features of npm?
At least I got the second part right! :D But yeah, I guess the author was not content with https://www.npmjs.com? Is it even supposed to replace it? I have no idea.
Seems pretty clear to me: it's a way to search for npm packages that are published as ES modules. You can't filter by that on npmjs.com, so this does fill a need. The other parts of the project help you publish packages in ESM format, which can be a pain to do manually.
These packages are still on npmjs.com. This is just another way to search the repository. The author can't fix npmjs.com because I'm assuming they don't work for npm Inc.
Edit: apparently it is not a package repository, my bad.
Could someone please explain to me what exactly it is and its use cases? Is this supposed to replace some of the features of npm?