you would be surprised how many people do NOT know the keyboard
shortcuts like that and do the actual move the mouse. In most cases of using the mouse it's a lot easier to just right button click and select 'copy' in the displayed sub-window, then do the same to select 'paste' for where you want it.
However, touch screen is NOT an absolute answer and it is NOT as good to use as a mouse is for fine selection. For most productivity work a touch screen system is actually a backward step.