I am with with Other School.
I my self is a ERP Consultant and ERP Implementer. Taking example from my own experience.
Whenever a innovation is done, needs and expectations are always taken care. But still there is always a scope of enhancement. As per Green Belt process," There is always a scope to refine a process". When I explain about ERP to users and management they use to have lots of question. But when they see actual product, then their 90% got covered. 10% is only left for new requirement and some process improvements.