Yes, they mostly put them there to make the customer think that they have bought a better mower, like the older style with the taper bearings with separate races and seals, which would let the old dirty grease escape without destroying the seals. But folks will grease the living piss out of the zerks until they hear a pop and see grease ooze out everywhere, but that pop was the seal popping loose, so now grass, water,crud, whatever can now get readily sucked into the bearings while mowing, and their life is seriously shortened.