The simple logic would be this:
When you hand off your 2D drawings, who do you give them to? An internal engineer? An outside manufacturer?
How much time and money is spent at the next phase, where the 2D is converted to 3D for tooling. Not sure what specifically you make or how it’s manufactured, but chances are if it’s made of plastic eventually it’s going to need to be built in 3D.
How many design iterations have to go back and forth between you and the person on the other side of that wall?
Within our organization, bringing 3D to within the ID group shortened the product development cycle by months. There was no more back and forth with engineers of “this curve isn’t curvy enough” or “this transition should look more like this”. By taking ownership of the 3D and handing off good clean solid models that were usable by the engineers (able to be shelled, drafted, etc) it was a major revolution in the way we do work, the quality of the product that was delivered, and the power held by the ID organization.
With that said it requires that the ID team be willing to own and deliver on all that additional work. In some ways the 2D handoff is “Easier”