You loose precision when dragging freely, as you sometimes want to go back exactly where you were prior to moving the selection. Use case:
At position 6 s 176 ms I have a 367 ms selection. Now I want to quickly go back to 5 s 075 ms and copy 367 ms from there. Then I want to go back to 6 s 176 ms and paste what I copied there. I often want to do this when working with chopped up loops and beats.
Yes, I can eg. create region markers for current selection, then Control-Shift-drag to somewhere else and copy, then Control-Shift-drag back to original position (the region) and paste; and finally delete those region markers if I don’t want them there.
That process could be shortened dramatically by having a keyboard shortcut to move selection backwards or forwards, by the same increment as the selection length.
In a rhythm loop, let’s say 2 bars with 16 beats where all the beats occur at regular intervals, this is especially useful for duplicating particular beats to multiple places.