Hey! We appreciate your feedback about margin and docking feature.
We are currently working on improvements related to these features.
It may be difficult to understand the logic behind docking&margin when you move from classic Wix Editor. I totally understand your concern.
My suggestion would be to use docking in combination with grids and containers.
it is always a good idea to dock an element to grid line or container to control its position.
Check useful resources and tutorials here - https://support.wix.com/en/article/editor-x-useful-resources
Cheers!