Also, have you ever used an iPad with a cellular modem? It's a far better experience than tethering. One (larger) battery to run down instead of two, lower latency (the extra hop from iPad to phone over Wi-Fi is gonna add at least a few dozen ms to every single web request), and best of all, I don't have to think about it. I don't have to wait, or fumble around with my phone. I take my iPad out on the train, turn cellular data on in the control center, and in half a second I'm connected to 5G. It's a vastly better way to connect on the go. Tethering is a last resort for me.