It can be quite convenient when you want to show a specific microflow to a colleague for example.
Instead of a screenshot you could ModelShare it, and your colleague would be able to 'look' in to the actions.
I'm not sure the idea behind the ModelShare was to upload reusable 'complex' microflows for reuse.
Modelshare is just there to show the microflow in more detail. When asking a question on the forum you sometimes need to see the microflow. Just posting the image of the microflow will not work. So hence the modelshare.
Just found the feature. This would be cool if I could choose to publish this "privately" within the context of the project/app. I have less use for a function for sharing my work with the world.