One thing that I really struggled with in the past with Global Blocks and Global Blocks Editor was that you could not preview a page type, product, etc. So whenever I would create a Global Block that required a lot of Dynamic Contents it would look all broken due to no data being pulled.
Yes, I could set up a section with the looper provider but seemed a bit counter-intuitive. Having a Previewer similar to the layout builder would work really well in my opinion.
I think if we had this implemented into the Component Builder would really help this issue.
There might be other use cases where this would be useful that others could think of but this is the only one i could think of.
Not sure what others think about this or it might just be me haha.