joshing, but...
To get the advertised speed out of most WiFi routers requires that your client device be positioned right next to them anyway. Might as well just patch in a cable.
Ah, you say, my device has no ethernet port! I dare say that it doesn't have the particular kind of WiFi adaptor required to realise the router's advertised speed either.
Still, 40Gbps WiFi sounds nice. Shame that your BT/OpenReach-supplied internet won't get much within one thousandth of that.
-A.