A common issue I've had with using Git repos directly as Node.js modules, is that many projects are transpiled/built before publishing to NPM. Depending on specifics of that build process, it may not work out of the box (or at all) from a node_modules folder.

With NPM acquired by GitHub, I can imagine them "filling in some steps" by leveraging the fairly new Actions feature, so that repos can provide built artifacts, the same ones as published on NPM. The deeper integration will be an interesting development to watch.