It's me being picky about the meaning of the word "aided".

CAD is software to help people make complex things without having to do complex geometry/trig/general maths.

OpenSCAD doesn't really "aid" you much with this. It's a 2D/3D shape generator with boolean operations, but because it doesn't let you do constraint operations on 2D geometry, and it doesn't let you do further operations on the fundamental geometry (faces, edges, vertices) of the generated 3D solids either, it never liberates you from most of the difficult work.

I'm not even sure how much it aids you with "design": it doesn't support chamfers or fillets, it offers no tools for adding drafts or making truly uniform thicknesses. And it only generates meshes.

OpenSCAD is useful. I'm not saying it's not. But it is useful mostly for drawing strongly geometric or mathematically-derived solids and producing a mesh from it.