The ramp is under so much pressure to turn a/c round mistakes and accidents are unfortunately going to happen. I often see a/c approach a stand that has not been checked for FOD and no parking guidance switched on. However a/c commanders are under the same pressure and more often than not will simply proceed without guidance and without any knowledge that the area has been checked.
Speeding is also a problem, generally caused again by the requirement of a mega quick turnround.