"Why would someone want to take V4 and make her into an exact copy exact texture mapping, exact morph sets as of V3... assuming they already have V3?"

Perhaps to make use of V4's improved expression morphs ?
(Although any of V4's "All New And Improved" expression morphs could have been easily created for V3, too, with equal result. See KIELO for example)

"Why not just use V3?"

Personally I will continue to use modified V3 and Laura meshes, because despite V4's additional 69 (!) magnets I'm still dissapointed with her bending abilities.
(Among a lot of other things)

But people will switch to V4 just because everybody does.
Especially the top merchants.

V4 does have some improvements over V3, but so have AIKO and Laura.
I'm just thinking that completely breaking backwards compitability with V3 was more of a marketing than a technical decision.

:biggrin: