The problem: There's no obvious way to close programs, the way you can by hitting an "x'' at the corner of the program in older versions of Windows. You need to figure out how to drag the app to the bottom of the screen, and the way you do it depends on whether you are using touch or a mouse. Stray too far to the left or the right, and your computer will enter a multi-window mode instead.
The solution: Restore the "x." Don't force people to do gestures that don't seem intuitive to the task at hand.
The problem: In making it easy for touch screens, mouse and keyboard commands are more complex to use and figure out.
The solution: Don't try to be a one-size-fits-all operating system. Apple and Google have kept their systems separate for touch-screen mobile devices and for traditional computers that use mouse or trackpad controls.
Microsoft can improve usability by designing the operating system for one or the other. Don't expect this to change in the promised update, though.
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