Right, so it all started when I tried bspwm a few years ago and noticed that it didn't have a feature to minimize/hide windows. So, I looked up what that was about and one of the devs said that you shouldn't minimize, just move the window to a different workspace.

And yeah, that broke my brain. Because it's also a tiling window manager and I was on a small laptop screen, so only 3 windows would fit on a workspace at most.

But after using it for a while, I noticed that:

1. It reduces complexity. There's one fewer place where your window could be hiding.
2. Combined with the tiling, it means that windows always have a place where they are. You scroll through your workspace list and it's going to be open/visible somewhere.
3. This also means I can place windows next to each other when they're related. Or onto the same workspace, if I actively want to see both of them. And if two groups of windows/workspaces aren't really related, I can leave a workspace empty between them.
4. This would work a lot better with a minimap to show where the windows are placed across workspaces.

And yeah, eventually I tried replicating this workflow in KDE, because it has the workspace pager for my minimap (I have my workspaces in a column, so they fit onto the panel).
And so I found a KWin script to do the tiling (currently using Polonium), and realized that Activities are really useful for splitting up completely unrelated windows, too.