Your comment baffles me. The Metro experience did not behave like a tiling window manager in literally any way I can think of.
I switched to Windows 10 purely for the Surface Book hardware a few years ago. Before that, I was a contented Arch Linux + i3 user. (And my next laptop will probably be back to Arch Linux, with Sway instead of i3 because Wayland > X.)
The split made, and still makes, no sense at all to me as a tiling window manager fan. It maintained two separate worlds that you could not easily switch between, which is fairly antithetical to a tiling window manager. And functionality like, y’know, tiling, was non-existent. (And tiling does exist just a little bit on the other side, with window snapping.)
It was a window-management disaster, wholly unmitigated.
The "modern apps" experience on Windows 8 and Windows 8.1 was built on a horizontally tiling window manager. For the most part that tiling window manager is disabled/crippled on Windows 10. (It's ghost kind of exists in Tablet Mode only.) It was heavily gesture based, so few people pushed it beyond the single split it would sometimes do if you opened a new app from a current app, and few people learned its gestures or keyboard shortcuts. But it did go far beyond a single split if you had the monitor space and the apps for it.
Early on most apps, because of Windows 8's attempted focus on Tablets/Phones typically only supported full screen, half screen, and phone widths. Windows 8.1 added a lot more responsive screen sizes to more of the apps, adding a lot more variety/capability to the ways you could tile apps. The classic Win32 desktop even lived "inside" one of these tiles in Windows 8.1, so you could tile apps on both sides around it.
At various points in Windows 8.1 I'd have a half dozen apps (including the Win32 desktop as a single "app") tiled across two 16:9 monitors. It was actually a very nice dual monitor desktop experience and a good use of all that horizontal space, which I will continue to point out to people that didn't believe the tiling window manager made as much sense for desktop users as it did for tablet users. (I joke that I wish I could turn on Windows 10's Tablet Mode on dual monitor systems still, even as anemic and nearly dead as the surviving tile manager is.)
I switched to Windows 10 purely for the Surface Book hardware a few years ago. Before that, I was a contented Arch Linux + i3 user. (And my next laptop will probably be back to Arch Linux, with Sway instead of i3 because Wayland > X.)
The split made, and still makes, no sense at all to me as a tiling window manager fan. It maintained two separate worlds that you could not easily switch between, which is fairly antithetical to a tiling window manager. And functionality like, y’know, tiling, was non-existent. (And tiling does exist just a little bit on the other side, with window snapping.)
It was a window-management disaster, wholly unmitigated.