Was this a whole new driveway or did they pave over an existing driveway? If new, they didn't prep the roadbed right or whomever was working the paving didn't notice less material being laid down in the area.
The problem with repairing spots with a triangle is if the finishing of the area isn't done well you will notice the difference both visually and when driving over it (high vs low spots). They can possibly spray sealant over and match the driveway, much like someone repairing a patch in a wall would feather in a repair and paint match the repair with a larger segment of the wall. That should limit any visual issue. Not signing off on a repair until it satisfies you should help with the other. If you drive over the area and it's no longer smooth and you can feel transitions up or down they haven't done the job right.
