What is the disadvantage of BBIN?

One major disadvantage of multilateral accords is the coordination required and nations' failure to satisfy that demand. Meetings, discussions, and forums, as well as their practical execution, are required for these agreements to work. Another critical aspect of this accord is its political component. This alliance will also serve as a deterrent to China's expanding influence in the area,and  a strong front for sub-regional South-Asian unification. However, these nations' motives must be strong for this agreement to be implemented. The lack of trust between these countries is an additional impediment to the implementation of this agreement. The history of the India-Bangladesh border, the current schism in India-Nepal ties that resulted from Nepal's territorial claims, and other small but numerous concerns create a breach in the harmony of these processes. It is difficult for these countries to overcome these political and historical hurdles to collaborate on a project that would benefit all participating countries but is being delayed owing to poor diplomacy. Furthermore, diplomacy may play an important role in enhancing international relations. It has room for development to help regional interactions. Misconceptions caused by previous events cannot be altered, but they may be improved. Conflicts and tensions are caused not just by historical events, but also by the polarization of countries' interests today. Another barrier was Bhutan's refusal to ratify the agreement because it feared it would harm the local transportation business. China's BRI programme aspires to connect South Asian countries as well, which will be a competitive aspect of this regional endeavour. China's approach to these nations may put them in a bind, requiring them to weigh the costs and benefits of both deals. All of these problems have hampered significant regional progress in South Asia, which can only be achieved when these nations take the first step toward independence and incorporate regional cooperation as an integral component of their diplomacy, projects, and policies.