Drag-Copying selected subobjects - display is confusing

Been meaning to post about this for awhile. When pre-selecting subobjects, then using Alt + Gumball arrow to copy them while dragging, the display still looks like there is no copy being made and that the original object is being modified. I find this confusing, it seems to me that the modification preview of the original object should be shut off when one hits the Alt key to make a copy…