Nuclear weapons in a Level 2 Civilization are tactical weapons, and between Mechanical Cities, there is a nuclear non-proliferation treaty.
But the real reason for nuclear non-proliferation is because 'nuclear proliferation' has happened too often. If it increases a bit more, it might just create another large Uninhabited Land.
So, there's an understanding among Mechanical Cities on the same continental plate to minimize the use of such large-scale destructive weapons.
However, the Guanzhong Plate is a small continental block with only one Mechanical Main Brain.
Therefore, the sky this morning is unusually bright.
The first five nuclear bombs were aimed at the strongholds of the Five Great Families.
The subsequent fifty nuclear bombs were for area strikes.
