This is because the topography of most countries in South Asia is very bad, and most of the domestic topography of many countries in South Asia is mainly mountainous, which makes it impossible for countries in South Asia to vigorously develop domestic agriculture. Coupled with the multi-ethnic and multi-lingual situation in South Asia, there are often many obstacles in the communication between South Asian countries and people of all ethnic groups. From this point of view, it is not conducive to the construction and development of the whole country and region.
Of course, the most powerful country in South Asia belongs to India. India's economic development has indeed achieved a very good level in recent years, which has also enabled India to earn a lot of foreign exchange in the past few years. However, the gap between the rich and the poor in India is also growing. This is because there are serious caste system problems in India. In India, the low-caste people simply can't receive a good education, which also makes it impossible for the people to change their lives through education, while the high-caste people in India can study abroad through a good education, so we now see that many executives of multinational companies are Indians.
In addition, the infrastructure construction of countries in South Asia is very poor, which makes it impossible for South Asia to complete its own industrial development. If the infrastructure is very poor, it will also make it impossible for international investors to invest and build in South Asia. Although the population in South Asia is very large, most of these people have not received a good education, which makes it impossible for the huge population to turn into a huge demographic dividend. If the people in South Asia want to improve the present poverty and backwardness, they must try their best to receive a good education.
Therefore, although countries in South Asia occupy an excellent geographical position, countries in South Asia have not made good use of this geographical position, which has also led to countries in South Asia being still in a very poor and backward situation.