The St. Louis Blues and their fans are used to getting a little of the cold shoulder from national media. It is just easier to focus on teams from out east or way out west.
Those particular cities, plus Chicago, have a larger population. So, the theory is that more people means more fans. Blues fans showing up at every single road game in 2019-20 is disproving that, but I digress.
If nothing else, a lot of it simply comes from the vast majority of media members being in those cities. It is easier for a reporter or league correspondent to discuss something about the Rangers or Capitals or Penguins because they are all right around one another and they see those teams on a regular basis.