The biggest thing for me with any journaling app is privacy. Anything going off-device and not staying local is an automatic no from me. Anything using OpenAI is another no from me.

That said, I think it's a nice idea and would think it's best for mobile devices and needs to be easy to open/use. Like Apple's Voice Memos but better. I think a great combo would be speech-to-text, but also a search function that combines text but also speech-to-text. Provide Shortcuts for power users, etc.