CAD program in Toy Design

We give the 2d ortho drawings directly to the manufacturer and have them engineer it. We do waste alot of time going back and fourth and after all the back and fourth it is not satisfaction that ends the process, it’s usually the deadline that dictates whether our changes are doable or not. It was my feeling that 3d would shorten that time. Thanks for the input.

In what instance would you say a 2d drawing would work better than a 3d model?