Yeah, I can type faster than I can write, but I can write faster than I can type on phone. The note winds up in a physical location, which helps me with both retrieval and remembering (say, this section of my desk-cube-thing is for project notes in my garage, this section is events, this is things I need to buy from the shops etc). I can draw little images pretty easily as well, have not habituated to digital art unfortunately. While not insurmountable with apps, is it really worth the additional effort shopping around when I keep inheriting post-it notes and data cards from various sources (idk why).
Also, I get bonkers distracted on the phone. I sometimes forget I am just checking the time.