If you followed the Interactive Guide on Bridging G1100, then I am the creator of that guide. Hello there.
Field Tech's advice would create a double NAT situation, which adds nothing but potential IP conflicts, port forwarding difficulties, and delays on reaching the Internet.
LAN from QGR to your router's LAN is reducing your router into a switch with an access point, bypassing its routing capabilities. This is expected as you only need one router to route between the WAN and your home network LAN.
