Yes, this is an interesting topic!
In general I think 3D is more for engineering and 2D is for conceptual design. However if you learn to use 3D all the way, it is probably a saving in the end but I doubt it will be made quicker?
It might also be different tools for 3D renderings and 3D cutting which at least what I am experiencing now will add costs.
As an example, my 2D line drawings with all frames on a 40-foot hull is estimated to take more than 80 hours to translate to a surface for CNC-cutting.
This is much more than a day...
