In the early days of the ninja village's establishment, when everything awaited revitalization, they indeed needed the financial support from the daimyo. However, once the ninja village had developed, the financial aid from the daimyo was important, but more often it became a constraint to the village, limiting its development.
After all, there are numerous powerful countries in the world, and although the daimyos from different countries shared a unified idea inwardly, they held back their impulses due to lack of extraordinary powers themselves. They thought it wiser to be cautious, as they were mere mortals who could be killed by a single shuriken.
Furthermore, the attitude of the daimyos would indirectly affect the morale of the ninja during wars among villages and could even play a decisive role in the outcome of a war.
