I agree with you, Dortmund's performances will often decline in the second half of the Bundesliga, they are not consistent until the end of the competition.
However, today I give a round of applause for the performance of those who have played an elegant, solid game and good cooperation with a squad that I think is simple, and I think they deserve the recognition of all Borussia Dortmund fans.
The win over Hoffenheim was very important for Dortmund to maintain their win at the start of the Bundesliga season, and for the time being they are top of the Bundesliga standings.
Try to see how far Dortmund's consistency has been this season, especially in the first half of this season. Because if Dortmund can continue to be consistent by winning more games, then Dortmund will compete with the defending champions of the Bundesliga (Bayern Munich). But if the consistency starts to dissipate in the second half, then there will be no competition to be seen in the Bundesliga except to see Bayern Munich win again in the Bundesliga.