That's a totally ridiculous looking piece of kit (the RT-AC3200)! Who, in their right mind, would want that sitting in their house?
It's starting to look like the multi-blade razor market. Six antennas to beam you closer (in the remote possibility that you actually have anything that'll benefit)!
As soon as 5GHz gets really common isn't everything going to start to suffer from the same problems 2.4GHz does in busy areas?