I love taking notes with Onyx Boox Max but I miss the Handwriting recognition feature of Windows 10 app "Nebo". (
http://www.myscript.com/nebo/)
There is Android app "My script Smart Note" from the same software house but it is no longer developed and it is laggy on Max.
With this app you can convert you handwritten notes into Word file, you make them researchable, you can enter math formulas, diagrams and so on.
I noticed that there is no e-ink note-taker with this feature. So if Onyx contacted them and use their SDK (
http://myscript.com/technology/#developer-kits), they could adapt the software to e-ink screen and would have the best note-taking app among these devices adding a great feature to their devices.
I think it would be a fruitful investment.