The Germans are a practical people, and very mechanically talented.
IMO, when they retained the Luger round,(9X19mm) they adopted
a superior bullet which was years before it's time, in an efficient
caliber, and driven by a very well rounded powder weight, for
it's general purpose.
It's taken over a century to field munitions considered to be superior,
even with technological improvements, and despite government
purchasing paradigms, only time may tell if these new calibers will
succeed in replacing 9mm for power, range, penetration, and