Not having the ability to create and open notebooks from a local or network drive is crippling. I'm all about moving to newer technology and staying up to date on software (which is why I pay for Office 365 to begin with), but replacing the awesome OneNote 2016 app with the W10 version before it reaches FULL feature parity is an incredibly backwards thing to do. I use OneNote 2016 to stay organized with all of my projects for work. However, I'm required to store my notebook on a company server and it cannot be uploaded to OneDrive due to our security policy. I really hope MS thinks about this moving forward...I know they want to get everybody using OneDrive, and I understand why, but some of us just can't do that for security purposes.
I'm disappointed to see the response from Microsoft be "oh dont worry it's easy to move your stuff to OneDrive". They're either not getting the point, or are telling us to leave the platform.