EAX80 vs new Orbi AX6000

You already have a EAX80, then you may want to just replace the current wifi router system with a RAX80 wifi router and keep the EAX80 since you are invested in that unit.

I'm unsure of the EAX80 would connect to the Orbi AX system. I don't have one so I don't know. Something to ask NG support about. 

I have the CAX80 cable modem gateway which I presume the EAX80 would connect well up to if you wanted to go that route. 

The CM1000, 1100 and 1200 are all D3.1 supporting. And yes you would need one of these with the RAX or Orbi AX wifi system. That CAX80 is it's one modem and router. 

Current Orbi AX has been maturing over the past few months and FW seems to be stable now. v32 is was is current and for me, its working well. There is one bug that I hope will appear in next update which only effects two or more game consoles being online at the same time. NAT Filter is not working right. I has been fixed and we are waiting for NG to include it in the FW. Others have reported seeing odd wifi connections issues with Orbi AX. NG has been using a lower CTS value which they seem to want everyone to use. Historically its has been 2347 which has worked well. For those users seeing these issues, we recommend changing to 2347 which resolves there problems. 

Also there is no way to disable the SSID broadcast on either radio which is offered on Orbi AC. This helps user with 2.4Ghz IoT devices connected on Orbi AC. With this feature not available on Orbi AX, users have had bad experiences getting new IoT to connect. Users can lower the power output on the 5Ghz radio to help force the setup phone or pad to the 2.4Ghz radio. Another consideration is to use the same SSID name and PW on the new Orbi AX system and ones prior wifi router, this makes migration to Orbi AX less of a hassel with some if not most wifi devices. I've use the same SSID name and PW for years and Orbi is working fine for me currently. 

my 2 cents.