There was actually somebody here that posted some interactive WG stuff for that here a while ago, it was somewhat limited due to how daz models handle bellies, but it was interesting stuff. I’d dig out the post for you but I’m having trouble finding it.
My biggest issue with Virt-a-mate is that I just find it rather uncanny and unsatisfying, due to my familiarity with the genesis 2 models.
I work with it myself and yes, with a few additions you can make pretty decent stuff.
As far as weight gain content goes you can make your models get pretty big and still look decent, but if you want to make some real high quality stuff DAZ remains your best bet by a long shot
Yes VAM2 uses genesis8 and a slew of features that vam1 and genesis8 both lack. MeshedVR posts progress updates in frequently but those updates are pretty impressive: