I'd look at it this way:

Content developers provide content for what the customers want.

So really the majority of customers dropped Genesis 1 like a hot rock when V6 arrived and it became unfeasible for vendors to keep supporting G1. Also the improvements of G2 (mainly the fact that vendors could visualize making female clothing on a female shape rather than the androgynous shape), brought vendors  (and customers) that held out on G1 into G2. So really I'd wouldn't be pissed at vendors for supporting what the majority of customers really wants.