I know what it does, the point is that the 'search' box is actually a 'location' box and nothing more.
Same for Spotlight really. If I type 'humidity' it does not bring up the Weather app value or even the Weather app as a suggestion, but it does (to its slight credit) bring up 'Home' or 'HomePods' tip on how to check the humidity of a room.
yeah, most people search for cities, not search for something slightly lower on the main screen. I suppose they could change the label to 'search city' for you.