If you’re explaining something to another human in person, you’ll often reach for a pencil and paper to make it easier. Perhaps you’re drawing a map, or a quick diagram of that chest of drawers you think would look great in the guest room.
And that’s in person, where gestures and feedback from the listener help communication. Given the limits of email, then, wouldn’t a sketch, chart, or diagram be even more useful? The answer is a resounding “probably,” and the best news you’ll hear today is that it is dead easy to add a drawing to your emails, even without an Apple pencil, and even on an iPhone.