The conclusion is wrong. The point of using these media queries is that:

1) You can only use tiny buttons with precise pointers.

2) You can only use hover popups with pointers that can actually hover.

In practice, much of this is too much work and everyone just designs for touchscreens instead. It's rare to find a website that even bothers with using title="" for tooltips because smartphones are a disaster of UI and lack tooltips.