Adding digital handwriting support is a great idea. I actually think other companies do it pretty well, which is why we didn't go down that route. The reason is that they use a different type of algorithm that learns, in part, from the handwriting velocity, and gives you edit access on the go, which is not possible if you've taken the notes in a normal notebook.
We decided to start with plain notebook text mainly because it seemed like no one else had solved this problem to our satisfaction yet.
A big business atm are cheques. I .. don't understand what they're for, consider them weird. But there is a huuge number of places that use them, the US is a part of that for some reason.
A lot of those are filled in by hand.
Say, you're doing a census project. You send out forms that WILL be filled in by hand.
That said, I don't believe in silver bullets here...
I mean, taking photos and rendering paper notes to digital has definitely been done multiple times already. This other approach would become a must-buy app for anyone who uses their ipad pro or surface pro for notes.