Luck does not need to start from the beginning of the season to the end of the season. The luck that is being discussed in this context happened at the final match day of the Bundesliga. I also want you to know that the place of luck does not eradicate the place of hard work. There is no doubt that Bayern Munich has worked hard, likewise others clubs in the Bundesliga. Bur on the final day, not many people believed that Dortmund will not be able to win Mainz. This is where the place of luck is seen. Even if Bayern Munich has to win their match, they still needed to rely on the luck that Mainz brought them to become the Champions.
The key to his luck was indeed very visible in the Dortmund vs Mainz match because it was the result of that match that determined whether or not the Dortmund team apart from Bayern Munich had to win in their last game. What you say is quite logical because luck doesn't have to come from the start of the season to the end of the season, but it can come at any time for any team in a season. And coincidentally this season Bayern Munich still got this because Dortmund was not lucky enough after struggling so hard in this season that has ended.
unlucky in the last 11 seasons I don't think there is a logical reason,Dortmund played at home, in front of their loyal supporters and faced opponents from mid-table teams who are still below their quality but Dortmund failed to win, I can hardly believe it will this fact.
The Bundesliga is still unattractive this season, if a league is still dominated by just one team it means the league is not competitive, I really regret what happened to Dortmund this season.