Just here to add my 2 cents in hopes that Microsoft is reading this and actually cares about what their customers have to say.
Every time I try to use the new OneNote for Win 10 app, it infuriates me. I keep finding functionality you stripped out of it (like the "Paragraph Spacing Options" I found missing today), plus the lack of a ribbon bar and the removal of context menu options which require more mouse clicks to accomplish what I've done for a while now in 2013/2016.
Regardless of the product, PLEASE STOP taking away things that were fully-functional and that we relied on using and replacing them with half-baked garbage that you may or may not fix over the period of months/years. Either fix OneNote for Win 10 to include the features we've depended on, or go back to having two offerings.
You see all of the negative feedback on this page and in your UserVoice forum. Please do the right thing. Pay attention and FIX IT!