I seem to recall that earlier versions of Endless had multiple workspaces that could be switched to like in done in a generic upstream install of Gnome. Since Endless 4(?) has been released I have been unable to get multiple workspaces working. Either I am missing something or that ability has been dropped.
Personally I found dynamically creating and closing workspaces to be highly useful. Much like on a tablet every application is full screen and either swiping or keyboard shortcuts moves one from task to task. If that has been removed, I would enjoy seeing it back. And if it is there and I just can not figure it out, I would appreciate some pointers.
I use Endless on a Lenovo X230t which can be used and is often used as a Tablet. Moving/swiping from workspace to workspace easily is kind of the killer feature of a tablet.