I am not familiar but I thought they were doing these to protect local people. If dual citizenship is authorized then most will invest in land and property as safe heaven to avoid taxes in their adopted country driving land and housing prices. This does not stimulate economy.
If people are holding out from investing because of citizenship issue, most likely they are thinking od selling investment at a profit later and bring it back to adopted country. I do not see any benefit to Nepal, however I thought it was in its best interest to give out NRN card or similar protection to people giving up Nepali citizenship. I am in similar boat as well, and would personally benefit me if Nepali citizenship was approved but I am not sure if its in the interest of Nepal.