I don't see how this has any advantage over just deploying more NAT like people are already doing. Plus it adds IP options which routers hate. They claim "EnI

I don't see how this has any advantage over just deploying more NAT like people are already doing. Plus it adds IP options which routers hate. They claim "EnIP supports end-to-end connectivity, a shortcoming of NAT, making it easier to implement mobile networks." but I don't see where mobile network operators would care about end-to-end connectivity?