Supplier MOQs can create significant incentives to overproduce. For example, you get 9000 things someone wants and 1000 that no-one wants.
This can be profitable for the customer, if they can't just easily get rid of those 1000 they can't sell, it's presumably less profitable.
Presumably the split between things people want and do not want is not known a priori. It seems the EU is trying to legislate into an existence a solution to an unsolvable equation.