William Devereux, you requested we start using the Windows 10 version of OneNote. I've invested a little bit of time now on the Win 10 version but can't find anything much to trial. The very basics required for me to continue working with it aren't available so the notion of trailing it, especially in my 'real-world' context, isn't possible. Without tags (custom tags along with searching for documents based on tags) my whole note management system doesn't work. That said, I don't think 2016 implemented tags brilliantly either - nesting is important. However, if my tags-driven notes management system doesn't work the whole concept of UWP is irrelevant as it just means OneNote doesn't work for me … well … on all my devices.
To me the current Windows 10 version of OneNote, relative to OneNote 2016 is like comparing the Windows calculator to Microsoft Excel.