Oh wait, you’re totally right. Didn’t account for WAN limitations. Then I guess the only way to use the full Wi-Fi capabilities of this router would be to connect it wirelessly to another router...

The router shows a speed a bit below 100Mbps through Wi-Fi 5G. Points to account for: ISP: 300Mbps Ethernet connection between TP-LINK Router & ISP ONT: LAN6 (verified connecting various devices...