As soon as I set row=full width, the content is also extended. In a competitor's builder I can set row=full width; content=boxed (default). Thus I can use the interface to design the full width row; background, border, overlay, that the boxed content sits in.
If I also want content=full width, I set that by the custom container settings.
You must understand that many of us are designing for clients who don't know css or the importance of class names. If it is possible to customise using the 'standard' interface tools, that should be a priority.
We are told to design for mobile first.
You should design for noobie first.