It is recommended to use CAD
The advantage of line drawing is that there is no rendering effect.
I don’t know about 3Dmax software, but I know about general 3D software. There will be an imaginary light source shining on the surface of the object. The result is a highlight point, and appearance patent pictures or photos require that highlights be avoided as much as possible.
On the other hand, after 3D modeling, the effect of the complete front view of the brother is not as good as expected. The plane difference between the object and the observation angle is small or large, resulting in product distortion. So the line drawing is more clear.