And this is a special video number 4.

Why does a content creator have to delete and replace the obj files that Poser saves for him?

The video shows that Poser is unable to save a properly grouped and welded obj file for you.
This brings a TON of problems for morph creation, rigging, fitting room transfer and morph transfer, because all verts at all welds have a double, and the groups are left unwelded.

The video also shows the two ways to get around the issue, and continue working with the correct obj file.

Best regards, Tony