I don't understand why Victor release rackets with this specs. I don't think they sold X70, XLondon, XJJS like hot cakes.
I think it's the other way around. I remember BS-LYD and MX-JJS were sold out within few months after they were released to the market in few countries until Victor imported another batch to restock. Both have the same 4/4 BP and 4/4 stiffness.
IMHO, from the business perspective, there's no advantage for Victor to compete in N90 or VTZF kind of markets as Li Ning and YY have started their own market league. The 4/4 area is still available for Victor to close the gap. Frankly speaking, most of the amateur players don't need the 5/5, 5/5 rackets at their level, do they ?