How do you mean? Ken mentions
“Allow moving/dragging tabs from one workspace to another, deleting them, etc. (#13082)” as Number 8 on the feature-request-populartity list.
Not sure about you, by the way, but for me that would be huge. I so often, while browsing in workspace “A,” come across a site that belongs in workspace “B.” I want it out of my field of vision at that moment, but available in the proper context. Or, I realize that there is a smarter way of organizing my tabs by workspace ….
(And Spaces is great, but you can only have so many windows open before performance takes a huge hit.)