I suspect that's what it is. With the Danforth and other plowing style anchors, you need that absolutely level angle of attack. With the rockers, it's not as necessary. I've used the rockers with essentially nothing but rope. If you've got an anchor hoist, no problem with that level of chain. My anchor hoist is an aching 45 year old body, so I try to minimise total lift.

Someone raised the 7:1 angle issue. I think that's more than is needed. I generally do well if I have a 4 or 5 to 1 ratio of rope out.