I very often find myself needing to arrange elements that have already been aligned to the grid, and to do so, I select all of them and drag. For whatever reason, snapping doesn’t work when multiple elements are selected. I therefore have to squander time dragging each element of the just-moved group of elements in order to get each one to snap to the grid, almost negating the benefit of dragging them en masse.
If a selected group of elements simply snapped to the leftmost and topmost element in the group, that would be a tremendous productivity boon.