Apple has been rumored to support a stylus, but it hasn't materialized yet. 
According to online rumors, the iPhone stylus costs $49 (350 yuan), which is cheaper than the previous two generations of Apple Pencil. **Compromise results in a lack of functionality, no pressure-sensitive features and a built-in battery, powered by the phone screen, similar to the Samsung S Pen. 
I don't really know if it's a message, but Apple does have this in mind. Apple has received a new patent for its Apple Pencil for iPhones and can be combined with Vision Pro to enhance AR, VR, MR applications. 
Apple Pencil is equipped with an optical sensor that allows you to interact on touchless surfaces. On iPhone, Apple Pencil uses optical sensors to monitor changes in space and screen brightness,** by touching the screen or interacting with the air, and entering the positioning, orientation and movement of the device, so as to achieve operation in three-dimensional space. Although the patent uses the iPhone for demonstration, its core purpose is to support AR, VR, and MR devices, and it's not hard to imagine these scenarios. 
Jobs openly mocked his peers' stylus designs at the launch of the original iPhone. 
Cook's 2015 announcement of the iPad Pro and the sale of the Apple Pencil sparked a lot of buzz, with people beginning to ridicule the difference between Cook and Steve Jobs as the difference between an artist and an entrepreneur.
In fact, from the current point of view, Cook is not wrong to do this, the large-screen iPad is gradually developing in the direction of productivity, and Apple Pencil can greatly improve efficiency, and it will be more practical in some professional scenarios. But for a mobile device like a mobile phone, it's really a bit redundant. However, the need varies from person to person, and Apple can make Apple Pencil available on iPhones, which will also be convenient for those who need a stylus. 
If the iPhone is plugged into the body like Samsung, it will take up a large part of the battery, motherboard, and vibration motor space; But if it is used as a separate accessory, it will be "troublesome and easy to lose" as Jobs said, which is really contrary to the ancestral teachings.