I have an iPhone 11 and an ipad pro with the apple pencil. I don’t understand why there is no support for it. It would be really nice to be able to use my aplle pencil 2 insted of buying an extra 3rd party one. Why?
Because Apple hasn't made an iPhone that supports Apple Pencil.
If you want them to do so, you'll have to leave them feedback. We're all just users like you, and none of us have that kind of insider knowledge.