I guess that team was dismantled some time ago, with no on carrying the flag anymore. Modern windows is impossible to work on using just keyboard. Some mods & extensions do help. But the native experience is abysmal.
My touchpad doesn't work anymore. Why is it so difficult to connect a bluetooth mouse without a mouse? The "mouse detected, want to connect?" notification shows up ON THE SCREEN but I need to enter a bunch of shortcuts and navigate through multiple items just to be able to click yes.
The keyboard support in "Modern" Windows apps is so random. In the new Notepad, the dialog that appears asking if you want to create a new files shows Yes and No buttons, but it doesn't accept Y and N keys, only Esc and Enter. However, the dialog that appears when exiting without saving does accept S and N for Save and Don't Save. These inconsistencies are everywhere in UWP.
Yes and especially the new web-driven apps are terrible at it.