jtfox76 the problem with Modern OneNote goes beyond feature parity. It has the worst UI in the world for a PC. It is great for a phone, but for a 27" monitor it is a horrible horrible waste of space, and virtually impossible to efficiently drag notes and sections from one section to another, or one notebook to another, all of which is incredibly easy with the classic OneNote UI.
I know the goal was to have a consistent UI across platforms, but that only works so far. Having 3 panes of data (left, top, right) on an iphone is a mess because of the screen size. But having that on a PC is a joy to work with given its large screen. Look at Excel/Word/PowerPoint. Those have different UIs than do the phone/tablet versions, because the desktop UI on a phone would be horrible, and the phone UI on the desktop for Excel would cause a riot. Right tool for the right job. And "Modern OneNote" is not the right tool for someone that has been using it over a decade and cannot get a darn thing done with the new version.