The experience of winning the title is very important for them so that they are always consistent in every match. Frankfurt has had a good season finishing the way they have even though their hopes of winning are far from expected.
The Bundesliga has many strong competing teams such as Munich, Stuttgart and Leverkusen, they also appear very aggressive, no one can determine the champion in the season, at least they have given their best and can move up the rankings in the Bundesliga standings.
If not for the draw in the last game with Augsburg, Frankfurt would have been four points the Bayern Munich. But they had to struggle to get that home draw. You forgot to mention clubs like RB Leipzig and Wolfsburg who are not also doing sadly so far. The Bundesliga title is still open because there are still many games to play and some averagely rated clubs are coming up with exceptional performance. Frankfurt has become the German Champions in the 1958/59 season and has not won it again since then. Winning the Bundesliga will be an uncommon achievement.