I received an Ultra Hub and 2 extenders and the instructions to setup the extender requires one extender to be connected to the Ultra Hub via a lan cable, but the Ultra Hub has WPS capability, so the extender could be paired with the Utra Hub using WPS so you don't require the other extender to be connected to the Ultra Hub.
What I am missing here? It just doesn't make sense.. Why would you connect one router to another router??
It's a real shame that these devices don't have a WiFi repeating feature, as that would make them truly multifunctional (I also have a use case for this).
As they stand, the Wifi <--> Wifi connection on these units must be between themselves. This is so it can do some secret sauce to make the connection between the two super fast and low latency.
A modem wifi repeater will give you less than ideal speed and latency... and while products exist that do this they almost always suck.
By having a purpose built base unit (Station) and remote satellites you get a much better network. Unfortunately it's more devices and more power. Though if you have space for ethernet cables you can extend your wifi that way and connect direct to the router.