Unnecessary costs and problems further down the supply chain
I am convinced that early involvement results in a better solution with the best possible price-quality ratio. If you only start working on the packaging at the last minute, the delivery deadline becomes the deciding factor. To meet that deadline, you have little choice but to accept rush charges.
There is hardly any time to consider every detail of the solution. In some cases, this can lead to unnecessary damage to the product further down the supply chain. It can also result in unnecessarily high transport costs, for example because the packaging falls just outside the standard dimensions of a pallet.