So this protocol is for everything that connects to the router, not just router to internet? That means everything in my house, TV, IP cameras, phones, Ipads, computers, range extenders, my magic jack

I Have a AX1500 router that gives me around 200mps Wifi on my Spectrum 400mps connection. (I get 469mps on cable) My question is, if I get the new AX3200 or AX3000 pro router with a 2.5g WAN connectio