I can’t figure out if this is a new iOS 12 feature or not, but I think it is. I’m running the iOS 12 public beta and I discovered that you can send Apple your handwriting feedback in Apple Notes.
Handwriting Feedback in Apple Notes
- Open Apple Notes.
- Tap on a note with handwriting (you can use a non-handwritten note but there would be no feedback to give).
- Tap on the share button in the upper right corner.
- In the bottom list of icons, scroll left until you see Handwriting Feedback.
- Tap on it, then tap Submit.
Submitting handwriting feedback in Apple Notes presumably helps improve the algorithms or machine learning that recognizes handwriting, like searching for text in handwritten notes.