Sending data from the surface straight back to Earth can be very difficult. It makes much more sense to send it through a relay system.
What this shows is there is a lot of potential to set up a satellite relay system to create high quality communications between Earth and any Martian colonies. Although there is a 20 minute time delay between the two planets (depending on their current orbits). It will be nice for astronauts to know that they can catch the latest episode of their favorite TV show, or the latest movies.