It would be super useful for both myself and my clients to be able to preview and approve content as it would look in the feeds of the platforms they are scheduled for. As images and video become more important in content creation, and I need to coordinate Instagram profiles etc.  I recently trialled Planable, which had nowhere near the services I required for ongoing management (which is why I will be sticking with Sendible for now) but this way of displaying content and the approval process for content was really nice, and I had a lot of positive feedback from clients. 

In addition to being able to see posts, in chronological order as they would appear in the news feed - the content/approval process was really efficient.

If Sendible could offer a similar post preview / approval process that would be a much better UX for me and my clients. I am happy to send some screenshots of the tool.