"I can repair any booleans I made in MOI, to do it you have to know some repair techniques."

Right, just like subd modeling.

"But what you can do with mesh that you commit? I think only sculpt. "

If the generated mesh is better than the Groboto meshes (which they have said is the case), you will have a good mesh for further subd modeling after you are done with your booleans. So, no, not only sculpting. In fact, you could even put the mesh BACK into MeshFusion and do some more boolean work on it.