I think most of the rationale is around sharing components easily, at a level separate from NPM/&c. For things like JIRA/Disqus widgets, or for small components

I think most of the rationale is around sharing components easily, at a level separate from NPM/&c. For things like JIRA/Disqus widgets, or for small components shared across otherwise disparate parts of a large site (things like Office 365).