I completely understand your expectations.
Editor X provides you with the tools to give you full control to decide the size and position of each element on every screen resolution.
We currently have a few tools that will help you get your responsive site started, we recommend that you check out the designed sections and layouter from the add panel for reference.
If you are struggling to create the responsive site, then we recommend for you to visit the academy X to learn about our editor.
Here are some useful links to learn about the Grid:
https://www.wix.com/editorx/academy/grid
https://www.wix.com/editorx/academy/grid-editing
Please let me know if you need further assistant or have additional questions.
Dana