Agreed, but to add to this: media queries are still useful, and since a media query may hide/remove entire containers in the view then the remaining containers

Agreed, but to add to this: media queries are still useful, and since a media query may hide/remove entire containers in the view then the remaining containers may have widths that are no longer a simple proportion of the viewport width (or other property being selected for). So container queries can also enhance styles with media queries, not just replace them.