Why 3D CAD Models of a Building are translated to 2D drawings, to be built in Three Dimensions?

From it's inception as a rough sketch to the drawing board and now onto CAD
formats, the ability of a drafter to "visualize" what they see is paramount to the
accuracy of the drawings in relation to the "real world" in which the design will
be built. If the drafter can "see" by accurate 3d modeling, then the contractors
and builders who actually build the design will not suffer through revision after
revision of inept design done by those with no real world building experience.
The BIM, projected costs, and timelines for completion will all be friendly with
the bottom line of the project, thus better construction in efficacious form.
WE ALL GET PAID BETTER.