"DAZ create a COMPLETELY NEW AND  UNIQUE CHARACTER for each invocation of Victoria, Michael and Stephanie. Why can't eFrontier/CP do the same ???"

DAZ characters cost extra, EF characters come free with the program.
So you get what you pay for.

But frankly, V4 is good, but definitely not as good as she could have been, and the G2 series is a lot better than I had expected.

But not remapping Jessi G2's head so she could use Sydney's maps is a serious flaw IMO.
Actually EF could have easily kept MIKI's mapping as a standard for all the G2 females, so that the new girls had some instant support right from the start.