@hydn , You nailed it in this article. The workspace management is key, and once you get accustomed to it, it’s hard to go back. I actually cringed when I saw the KDE screenshot. It was what I used to do, but can’t go back. But as you mentioned, I too use other DEs including Gnome and Windows, but for the main daily driver it has to be a tiling window manager.
The other thing I would add, is that for multi monitor setups, it’s big plus. To be able to switch a workspace to a given monitor instantaneously without moving windows is a dream. This is another aspect of TWMs that I enjoy.