I really like this idea. One of the pain points in our organization is maintaining accurate documentation as things grow.
We have some external tools and documents, but as a developer, I really would love to be able to document the purpose and execution of a workflow _within_ the workflow. Sometimes we have to be a bit “clever” to get the exact behavior we want from the tools… this is all well and good until we come back to it months later and can’t remember why we did something a certain way.
I’m not sure how sustainable/responsive free placement of sticky notes would be, but it would be great to at least be able to place a workflow-level description and inline comments at workflow steps, perhaps like Word and similar tools tie a comment to a specific part of the document and allow the comments to show up on the side.