The main reason for those people that need to avoid using it is some figures do not like External Binary Morphs. V4 is one that some people have reported having issues with the Scene (or Poser itself) when using external Binary Morphs. Turning this off resolved the issue. If you do not use V4 and maybe M4, then it should not be an issue. I have not heard of too many reports lately so the issue may not be present with V4.2 and later.

ratscloset
aka John