Note how one flow literally erases everything else on the screen, disrupting whatever it was you were doing and disorienting any lesser-skilled users.
On a desktop computer. More than likely with (a) monitor(s) big enough to occupy an entire desk.
The Start Screen was fucking horrible all around, and its horribleness was proven with the immediate resurrection of the Start Menu and demise of the Start Screen in Windows 8.1.
Metro also met a similar demise because it forced a black-and-white, no delimiter UI upon desktop computers. Computers equipped with GPUs and monitors capable of rendering billions of colors with huge screen real estate.
Some of Metro's baggage is still with us, but I welcome Windows 11's slow move back towards a colorful Windows UI.