You can't use it effectively at terminal or lower altitudes, where speed & response time are critical. AD-2 is relatively slow as well. If the enemy degrades or disables early warning systems at the outset of a conflict, it could be game over. In Indo-Pak scenario, speed is the essence & unlike United States, which benefits from two oceans providing strategic depth, India does not have that luxury. This is one reason why Russia employs very high speed ABM systems with powerful boosters, in contrast to U.S. interceptors that accelerate more gradually. The trade off, however, is higher cost & a smaller number of interceptors that can be fielded at any given time.
