> Being able to call and send SMS is secondary.
This is the basic definition of a mobile phone for me [1]. We can all have our opinions on what the "killer app" is. And some may rather want a pocket sized computer. The old grumpy man in me wants to shout "Get off my lawn" - please do not redefine what a "phone" is. How much we all may hate telcos they at least have ensured world wide communications. I accept the fact that many today are willing to trade that away to each their own favourite corporate garden be it Whatsapp, Telegram, Facetime et. al. However it does not a phone make. Sweet sweet E.164 [2].
It might be an unfair interpretation but as I read it calls should even be secondary to games!
So in my mind you argue the focus should be on a tablet [3].
You might be wishing for another device class which is fair. But this kind of redefinition I find troublesome.
[1] https://en.wikipedia.org/wiki/Mobile_phone