For me, it means i can pull or push material. To me gravel is easier to push because you don't have to drive over the 4 cubic yards just dumped on your driveway. But when i tilt the blade [by raising or lowering the 3pt lift arm] to gouge out a 'gutter', it's easier for me to pull the blade--I can follow the road better--driveway is S shaped and a couple of hundred feel long. I don't have any fancy hydraulic hold downs or whatever so the only thing keeping the blade down is its own weight.
If you want or can drive over the material you pull, if you don't want to or can't drive over the material you push. You have those options if the blade moves 360 degrees. Mine also locks at 45 degrees to push/pull off to either side.
Decisions,decisions.