Truthfully, I see both sides of the argument, and I don't have strong opinions about it.
The player who dominates during the regular season league matches plays better overall over the course of the 30 games of the season. In this view, the championship match is just an extension of the season, 6 more games to give the player who did second best during the season a chance to play 6 more games to overtake the regular season champion.
Another way to look at the championship match is that it has nothing to do with the regular season, except that the players playing in it are determined by their performance during the regular season. The player who barely avoids demotion and happens to make it to the championship match has the opportunity to heroically rise from near-demotion to become the champion by being given an even playing field on which to duel with the dominant regular season player.
The latter sounds like the stuff from which movies are made. "It's the... eye of the tiger, it's the thrill of the fight, rising up to the challenge of our rivals..."
It would be interesting to abandon the championship match and have a tournament to determine a post-season champion. The regular season leaders in each of 4 C divisions play one match each to determine which 2 go on to play the regular season leaders in the 2 B Divisions. Then, the 2 winners of those matches go on to play A regular season 1st and 2nd place, and the winner of those matches plays for the championship. This would be a total of 4 rounds of play.
This totally defeats Stef's whole purpose for the league, if I remember it correctly, which was to have a competitive structure where poor performance on one day doesn't end your chances. But it would be interesting.