Apple does not even advertise the Apple Pencil for use with iPhones. Because, as you say, it's a dumb pointer on your iPhone.
I have an iPPro + Pencil, and it is astonishingly good. It is no 'dumb stylus' on the iPPro. The exquisite detail one gets from a writing implement is not quite replicated with the Pencil -- but! The fact that Apple does advertise the Pencil and its features is a hopeful sign that we will continued to see more, and more sophisticated Pencils & apps that use them. I hope.
