There are routers out there that are capable of having those 2 lines in aggregation at once and load bearing and so on but some limit the routers internal paths but you see that more on 2.5 gigs and above ie you have a 10 gig connection but you can only use 2 gig shared across the lan ports, the XR700 comes to mind.
Dont forget that lan ports mostly support a max of 1000mbps too so you will not get 2 gigs that way on a single connection.
Also with such high speed connections if you end up with a router with threat control ie IDS and IPS they can throttle your connection and the same applies to QoS if say you wanted to control bufferbloat on the BT connection as it’s upload is low. So say you went to Ubiquiti and purchased the UDM it will limit with threat control on to 850mbps where the UDM Pro can do 1 gig and over, they claim 3 gigs for the Pro model.
By the looks of it you are using a 2x2 client to test your Asus WiFi hence the throughput. The problem with at a distance it’s reading 100Mbps is that while you get that throughput and while the router can chuck out the signal at a good range the client can’t always communicate back so you end up with retransmissions which can slow down the network as the device starts to hog the airtime. The same applies to interference as the routers catching more neighbouring channels and while WiFi 6 clients have benefits any older device will suffer which leads back to why you might be getting the throughput you have depending on what client it is.
the same applies if the signal is too strong for the client which is why some will limit the transmit rate to suit clients and use APs to cover an area.
Ive the RAX120 and it chucks out the 5Ghz way too much and the stats don’t work correctly as it always shows 0 retries where I know at range it has to be where as the UDM I also use shows retries but again proving it’s accurate is not so easy but a least it’s showing them.
