The problem with this type of classification is that often the champions of a season are already known with 5 games or more left to the end of the championship, which takes out the enthusiasm of the games.
There are people who say that even halfway through the championship is a decisive factor to know who has a chance to win and who should be relegated.
I think a mixed system of scoring between groups followed by elimination (similar to the world cup of Fifa) is more interesting.
I believe that a change in the procedures of the Brasileirão would be valid!
I think a championship similar to the world cup is interesting... the first games are classified, and in the others, it would be a straight match, if you lose the game you will be out of the championship!