If a tournament ended in a round robin, there would be no championship match, no cinderella narratives, no crowd of people to watch and cheer on as things got closer and closer.

We would all play however many game apiece on separate courts at different times and the team with the best record (using the above tie-breakers) would be crowned champ later.

Not exciting enough for me. Look at the swiss system. It's how they run chess tournaments, it ranks people as the day progresses, and that sets up the brackets. But again, the round robin guarantees the most games to everyone.

We could have the remaining teams within the groups play a separate bracket I suppose, but to what effect? Best of the rest? In the 32 team scenario, it would be 17th place.