Other mesh networks such as Eero and soon Luma support hard wiring your sattelites. I think its extremely important Netgear Orbi does the same. Especially for those of us who can.
+1 for wired backhaul. For such an expensive system and it is after all, one of the top units on the market, it should get a wired backhaul fix. For future proofing, just in case teh radios weaken or die, wired backhauling should be a no brainer.