there is nothing surprising when the best Bundesliga team returned to their best performance, this victory achieved was inseparable from Bayern's focus on maintaining its position at the top of the standings.
Meanwhile, Union Berlin is a consistent surprise team this season so they are able to rank 3 in the standings.
now the competition for the top of the Bundesliga is back like the previous season between Dortmund and Bayern, Bayern's inconsistent this season has made the competition for the two teams very tight by having the same points.
I think Bayern "getting back to being best team" is not really a valid argument after just a few wins, we need to see them have this consistently. They started the season horribly, and then ended up on a great winning streak which saw them at the top of the league again, but then they had a few bad stretch as well after the world cup, and now they look good again.
If they don't go back to being bad again, then it is true that they are finally playing as well as they should, and that is great for them. However, for me to believe that it is going to go this way, I would expect at least another 5 wins in a row so that they would be building a solid foundation at the top.
I am not against Bayern at all and especially not when they play in the champions league, but for the sake of the 1. Bundesliga to be fun for us, I hope that Bayern will be running into some problems and keep the fight for the top exciting. If they now start a winning streak of 5 games as you said I think they will be too far ahead already. Dortmund had some close wins that could have gone the other way as well against Augsburg, Mainz and Hoffenheim. I am glad they won these games because then we can still be excited about the fight between Bayern and Dortmund.