A satisfying, game-like loop can keep an ADHD learner practicing, which matters. But tracing for dopamine builds engagement, not retention. The trick is to reward from-memory production instead.
A museum kiosk where visitors trace a character is a great engagement exhibit, and tracing is the right choice there. The goal is a memorable moment, not teaching visitors to write from memory.
Staying mentally and physically engaged supports brain health, and character drawing is a rich form of engagement. But be wary of anti-dementia claims. Here is the honest picture.