What I would like is for my cellular iPad to have full access to voice calls independent of my iPhone. This means, if my iPhone is broken, I can use my iPad as a spare phone in the meantime. What I also want is on the carrier end to allow me to have multiple devices that all answer calls to my cell number. Remember back in the landline days where a call comes in, all phones in the house ring? I want that! I also want a cellular chip in my MacBook Pro. Sometimes, it's just easier to answer a call there or make a call there and not have to worry if my phone is connected to the same network. It should all just work!
Plus with carriers doing away with contracts, and VoLTE being no different than data over LTE, it's high time where any device with a cellular chip should have full phone capabilities. Sure, it looks goofy using an iPad as a primary phone, but there are plenty of times where using the iPad as a phone is awfully convenient. Just like how I sometimes use my iPad as a camera, because it's already in my hands and I don't want to have to go fish for my phone!