This regards a comment from LjOsbon.
I strongly agree with all of your points of concern and I think I may have found something this week that I was not aware of.
Many have asked how to view locally stored notebooks, and I have not seen any solution until I tried the following.
1. I use a desktop as my primary and use my laptop as a duplicate for travel with the same Microsoft account. When both are online the OneDrive files are synced between each pc, including OneNote. I always wanted to know if there was a way to see notebooks without an Internet connection.
2. I disconnected the laptop from the network and guess what, all notebooks were still visible and could be edited and saved, I spent several hours trying to find those files to no avail until I discovered "OneNote "Cache". It is a folder in User/AppData/Local/Microsoft/OneNote that contains thousands of ".bin" files which I believe is the binary version of the .one files seen in Notebook, The size of the folder is almost identical to the size of the OneNote Backup folder.
3. I did some further research and found a Tech Tip from TechRepublic that sorta explains cache. I would like to hear from more knowledgeable followers that can add more information on Cache.
https://www.techrepublic.com/article/onenote-desktop-store-merger-what-does-it-mean/?ftag=TREe331754&bhid=24374948155099840970103257632982
https://www.techrepublic.com/article/onenote-desktop-store-merger-what-does-it-mean/?ftag=TREe331754&bhid=24374948155099840970103257632982