Why is image set required when creating a blog post?

[indrif]

I am using pinax blog and in the recent version the Image set property is required when creating a new post. Why is this required? Most of the times I want to create a post without having any images attached and having to create an empty image set for each seems unnecessary to me. Also it is impossible to reuse an existing image set for some reason. What is the reasoning behind this design choice?