Interesting take, but I can't see much use for it perhaps. I'd probably prefer vertical scrolling, and to be frank I did something like this a long time ago by setting my Xorg screen settings to be larger than my monitor (and then scrolling around with the mouse). Tie that with a tiling window manager like awesomeWM so that you can configure while you work and it should work out to be just about the same experience.
Highly appreciative of people trying new things though, I will never shut down people's desire to experiment. More power to them I say, one day someone might stumble into something that really really works wonders.
edit: sorry, I thought the project WAS PaperWM. but no it's cardboard that has been inspired by PaperWM.
Maybe this is a bit of a ridiculous idea, but what about natively supporting tabs in a window manager? While it would probably be impractical to force all applications to support tabs, it would be nice to be able to rearrange elements/windows of work/productivity apps as such.
This is not that far from the way macOS does it, where apps can go full-screen as if they were single-app virtual desktops.
You can flick between the apps, but the useless situation where apps are half-off the screen, like the wretched Metro interface on Windows, does not occur.
A lot of tiling WMs, for example i3, already support that. It can be useful when you want to hide a window like a long running terminal session, but I usually go to a new virtual desktop instead
For Windows, Groupy is a utility to group and tab windows. Works well with the built in snapping of Windows. Buy it on Steam and you can use it on up to five computers IIRC.
Highly appreciative of people trying new things though, I will never shut down people's desire to experiment. More power to them I say, one day someone might stumble into something that really really works wonders.
edit: sorry, I thought the project WAS PaperWM. but no it's cardboard that has been inspired by PaperWM.