This would allow us to "reuse" content from a newsletter, when referring to specific newsletters on websites, social media, etc.

For example: a social media post that ends with "discover more about this subject - read our last newsletter in full" (with a link to the online version of the newsletter in question)

This approach is also a lot easier than "share to social", which has severe limits (for example: it only allows you to post content on your own personal pages, not on company pages etc.)