Why Apple should make its Pencil work with the iPhone

OPINION: Apple has a choice to make. Will it make its Apple Pencil stylus compatible with devices other than its high-end iPad Pro tablets?
I think it should.
In 2015, when Apple first unveiled the Pencil, people wondered why the stylus wouldn’t work with non-Pro iPads, let alone iPhones.
Then, in 2016, when Apple announced the iPhone 7 and 7 Plus, people wondered why Apple didn’t make the phone capable of supporting the Pencil.
Now Apple is said to be planning its third iPad Pro. It