Why are blood relationships less important in industrial society than in an preindustrial society?

In industrial societies, social and economic structures are more complex and diverse, leading to a greater emphasis on individualism and personal choice over familial ties. People often rely on a broader range of social networks, such as friends, colleagues, and community organizations, for support and resources. In contrast, preindustrial societies typically prioritize blood relationships for survival, social cohesion, and resource sharing, as these connections are essential for meeting basic needs. As a result, the importance of blood relationships diminishes in favor of more flexible social arrangements in industrial contexts.