If the earth is 750 pixels wide in the default zoom, each pixel is 10mi/16km. Scale image of the ISS would be roughly 1/150th of a pixel.
Think about it: they say 19334 objects are tracked. Imagine that many cars or trucks in the world scattered all across. Then extrude that to couple hundreds of kilometers. Would that feel congested to you? 19334 new cars are being manufactured in less than 2,5 hours...
I otherwise totally agree with your point.