What annoys me is this: I have a TMobile iPhone 15 Pro and three Erro Pro 6 units, all with wired backhaul. Over the wire, my fast.com results repeatedly reach ~1.2 Gigs. Over Wifi, from a foot away, my results are around 650Mbps. The local church recently had T-Mobile install a 5G antenna array around it. I'm about two blocks away. Over 5G, I get 1.4Gigs down, though my walls, through an entire house between us. But…
Maybe you need to check your APs' settings, because these numbers sound off.
Edit: never mind, iPhones use 2x2 antennae. A little strange to not put in more in such a high-end device, but I guess it saves a bit of power. They do use 4x4 on the 5G chip, though? Very peculiar.