is it not making someone fix generated project is a massive work rather than building smething from the ground up?

I had a project where I was supposed to clean up a generated 3D model. It has messed up topology, some missing parts, unintelligible shapes. It made me depressed cleaning it up.

few of them was simple enough for me to rebuild the mesh from the ground up following the shape, as if I'm retopologizing. But the more complex ones have that unintelligible shapes that I can't figure what that is or the flow of the topology.

If I was given more time & pay I could rebuild all of that my own way so I understand every vertices exist in the meshes. But oh well that contradicts their need of quick & cheap.