Given how absurdly efficient shipping stuff in container ships is, I don't believe its actually worse. Specially if the company can just save money by being slightly more conservative in terms of how much they manufacture in the first place.
You're acting like companies enjoy flushing money down the toilet by making extra stuff. They are already making what they believe are the optimal number of products they believe they can sell. You think EU bureaucrats know their business better than they do?
The point is increasing the cost of over-production. Its not about the EU knowing better, but imposing a higher price for waste. Not sure how you are confused about that.