I wanted to use my own DHCP as well as network control, and I don't want to depend on the service provider's network equipment, so that any time I can put another internet connection anytime and all my devices ( some 30 unique clients including IoT devices) would not require re-config and everything would be seamless.
Plus I was getting very high latency with Xbox live and could not play certain games properly. Someone suggested using minimum network cascading and reduce multiple routers, also Airtel routers are not great for WiFi bandwidth, and no option for mesh WiFi.