"The sigils would need to be carved directly into the wagon frames and infused periodically during transport by cultivators that are making rounds up and down the supply lines. It's not revolutionary work in that regard, just an application of established principles that aren't used much anymore."
When technologies progressed toward the point of centralization, as was the case with most city-scale rituals… or like those that powered the fort defenses… the people making use of them often forgot about how things were like 'in the old days'. Like when the cultivators had to be spaced out to power sections of everything efficiently.
'And when all you have on your mind is the logistics of putting everything under one spot, you sometimes skip the actual value of things being kept apart. The value of keeping people on their toes and active, constantly checking on things. A central location makes things smoother, but is smooth always better? Does it always push others to do their best?'