Again, propagating scaling isn't relevant to this

DAZ's choices were

1. make F4 a morph that only works right in DS, and maybe someday in Poser
2. make F4 a morph that works in both but doesn't scale up any body parts
3. have F4 be another standalone figure.

We got 1 and 2

I wouldn't be opposed to petitioning for a 3 though B)

It's not the tool used, it's the tool using it