Yes. And yet people who use workspaces still use windows with multiple tabs, and have the layout of windows in the workspace dictated by application-level sorting.

I actually used a desktop that let you group content from different application in the same group of tabs for a couple years in college, by using i3/sway and a custom Firefox extension. It's an upgrade over just workspaces. I stopped working this way because I switched to tree-style-tabs and there's no window manager that gives you anything like that, and it was on net a workflow improvement.