How Prussia Won the 1866 Austro-Prussian War (no, it wasn’t just because of the needle rifle)

The famous Prussian needle rifle (Dreyse Zündnadelgewehr) was an amazingly modern weapon, technologically advanced, and massively superior to any other infantry weapon at the time… in the 1840s when it was adopted, that is.
By 1866 the thing was crude, obsolete, and starting to become a dangerous liability.
Yet the Prussians won handily against the Austrian Empire, routing the Austrians at Königgrätz, and establishing a new hegemony for Central Europe that would dramatically affect the course of world history right up to the present day.
In the most exciting 58 minutes of content on the entire KZbin platform, I will make almost everybody mad by explaining why Prussia won for many reasons, and not just because they had a gun that could shoot pretty fast.