Snapping is complicated in itself, but also because of the way all the controls and options are presented in Inkscape. Many options were implemented because we didn't know the optimal values at the time, because features were experimental, because people couldn't agree on the desired behavior, or just because we could. To make things worse, those options were scattered all over Inkscape. Recently however, some long overdue changes were being made to improve the situation (the snap toolbar was removed in favor of a new popover menu, the tab in the document properties with snap options was removed, buttons were renamed), which sparked some discussion in the chat group and in various issues created on Gitlab. There is however so much to discuss that I've tried structuring the topics into three new issues:
1) Changes to the snap settings in the document properties #133
2) Changes to the snap settings in the preferences dialog #134
3) Changes to the snap toolbar #135
In each of these issues, I've added a few comments, one for each topic to discuss. I've tried to limit the scope of each of these topics/comments to for example a single option or to a small subset of the options in a single dialog. If you want to join the discussion, then please use the reply button for that specific topic/comment below. Don't create new independent comments if not needed. I'm hoping that we can keep the discussion manageable this way, which isn't going to be trivial.
My general thought about snapping is that when it comes to snapping, there are many ways to Rome. If snapping cannot easily be achieved in the way you imagined, with a single action, then there are almost always workarounds. It might take a few mouse clicks extra, or require adding some guidelines or temporary objects, or even require typing in some coordinates or angles, but you will almost certainly be able to get things aligned or position where you want them to. It is important though that Inkscape tries to be as clever as possible about the user's intention. Inkscape should be able to figure out itself what to snap to, as much as possible. Most users will not be able to predict what will snap when, under which conditions, in which tools, etc. Snapping is really complex, even for the developers and the Inkscape guru's. That's also one of the reasons that these new issues are created, to get to the details. Our goal should be to make snapping easy to use, without getting in the way of the users, whether they are beginners or experts. Beginners should be able to get started with snapping, whereas the experts should be able to work efficiently.
**This specific issue is about changes to the snap settings in the document properties**
I've included a screenshot of the document properties tab, to which I'll be referring in the comments below:

























