He's got his job figured out so well it makes sense to have dedicated accessories and actually carry them around. He's a master of his tools, he must be really passionate about what he's doing(Or else he'd be staring at a screen). He's really made it.
But the actual experience... feels like work. And creates physical artifacts, which is then even more work, and phones are so highly addictive it really feels like work by comparision. Then if I go back and read them, I can't, unless I was carefully paying attention to each individual letter as I write it.
Not exactly something you can just pick up, it takes lots of experience to be able to write without being so distracted by trying to get your hand to make the letters that you stop paying attention...
Really the only time I ever write on paper these days is tabletop RPGs, a few checklists for very high profile projects worth having both digital and analog versions of, and a play I volunteered for where real paper made the most sense for tracking cues on lines of the script.