The regulatory function and policy related to major ports being decided by the Central Government in India can be attributed to the fact that major ports are considered crucial national assets and play a significant role in the country's economic activities, trade, and international connectivity. Several key reasons support the Central Government's involvement:

National Interest: Major ports are strategic assets vital for national security, international trade, and economic development. Centralizing control allows the government to ensure a cohesive and unified approach in managing these critical infrastructure elements.

Uniform Policies: Centralized decision-making allows for the formulation and implementation of uniform policies and regulations across all major ports, promoting consistency and efficiency in their functioning. This helps in creating a standardized and competitive environment.

International Trade and Commerce: Major ports are key nodes in facilitating international trade and commerce. The Central Government, being responsible for foreign relations and trade agreements, can align port policies with broader national economic objectives.

Inter-State and International Connectivity: Major ports often serve as gateways connecting different states and international destinations. Centralized control ensures coordination and integration with national transportation networks and policies.

In summary, the involvement of the Central Government in the regulatory function and policy decisions related to major ports is grounded in the recognition of their national significance and the need for a coordinated and standardized approach to their management.