Nobody is really arguing that we NEED another German army, but there is a concrete need for OKW to have new commanders to give OKW more options and strategies.
IMO the biggest weakness with the WFA factions currently is both are still stuck in extremely stale meta due to lack of commander choice.
Maybe the new Axis faction is designed as mobile and USF-like strong early/mid game force.
Some new commanders definitely wouldn't hurt, but not every faction is supposed to have all the options of other armies.
Shows you haven't seen last nights stream by relic.