This makes a lot of sense.
Having a plain workspace alongside would be perfect for me.
I am using Playground in my 3.0 (now having installed the new version with the nicer menus) and it works well. But this is definitely not what I use as a workspace.
One use case for a plain Workspace is when providing a kind of list of sample commands to customers to use on the image.
Like in: "Open this workspace contents, here are the typical commands for you to use".
Removing this ability and having a large thing popping at the right is really disturbing for these use cases.
Phil