Actually the fact that M3 and V3 were based from the same geometry was a good idea. It was so because they are of the same bipedal humanoid shape. Two arms, a nose, pairs of legs, ears and so on. Now if M3 has four arms and slimes rather walks that's a different story.

So I actually find the argument about the fact that M3 and V3 shares the same geometry quite irrelevant. I infact don't even understand how this had brought about heated debates in the past.

They are polygons nothing more. Points in virtual 3D space that can be easily modified limited only by the imagination of the end user.