This is soooo incredibly cool. Beyond the Tom Riddle diary aspect, I love the idea of this as a new medium for interacting with an LLM. You could gift it to someone and they could just write naturally, their thoughts, questions, notes, and get responses back without typing or speaking. It feels less like a chatbot and more like a journal you can communicate through. You could give it a personality and all.
I mean no offense, but it's kind of crazy that people think that linking handwriting recognition, a technology that was first rolled out 24 years ago in Windows XP, with an LLM is "soooo incredibly cool". I don't get it.
What really irks me about it is that the palm pilot I had 20+ years ago actually had BETTER hand writing recognition than the software on my devices today!
If by hand writing recognition you mean force you to learn their "graffiti" system, and write one letter at a time sure. Lets not even pretend newton did any better.