... No matter how you look at it, the geometry should be symmetrical from the start, the user should not have to correct for it, edit a cr2 etc..

I could not agree more! Problem is that real life and ideal life do not always line up and meshes with symmetry deviations beyond Poser's decision limit do exist. For me, I prefer to understand what is going on if symmetry operations go wrong and to have a tool to deal with it if I run into such situations, most likely when I screwed the symmetry of the mesh up myself.
I am not aware of an argument, and we are off-topic.