Actually, the German army took over 1/2 of Europe shooting other stuff. Their handguns pretty much sat in their holsters same as our 1911's did.
But you make some good points about the 9mm. I would add that it is not just for beginners though it is a good choice for the new guy buying his first firearm. There are many, many highly trained and experienced guys on this forum who have owned and shot everything and use the 9mm as their defense round of choice.