In my early rapid ideation sketches, I used a lot of the pencil motif.
While I still believe the pencil and paper, “hands-on” style brings life into the AI product, and spotlights the user more than the technology, relying on it too much became a little messy. The placement of scribbles and lines were arbitrary, and could have caused issues when handing the design over to developers.
In my mid-fidelity sketches, I cleaned up the scribbles and used just a few hand-drawn lines, mostly to draw (no pun intended) attention to a few important lines of copy.