They are 22 and 23 years old(i.e. Gnabry and Coman) and they are very good players.
It will take time for them to grow into personalities. Remember this Bayern squad were a gang of bottlers until 2013 and they had personalities like Ribery/Van Bommel/Schweinsteigger/Lahm etc back in 2010, Van Gaal and Heynckes just did a great job developing players and then they bought wisely.
Neuer
Kimmich, Sule, Lucas, Alaba
Tolisso/new DM
Thiago, Goretzka
Gnabry, New Striker, Coman
That team can easily last for 5 years and all the players are young enough to develop into world class players if they are not already.
It doesn't strike fear like the old Bayern team because at international level they haven't done much, other than Neuer, Tolisso and Lucas nobody has won an international trophy in that side, or even gone to a semi final. Ribery, Robben, Boateng, Hummels, Lahm, Martinez, Schweinsteigger, Kroos, Muller, Gustavo, Vidal, Gomez, Klose all had that kinda experience. They're also perceived as part of the old generation.
Bayern will buy better and get better in the process. It's a bit annoying that English clubs bought so badly back in the early 2010s, players were available for cheap even while adjusting for inflation but we'd go with the worse option for whatever reason...