Two main disadvantages of Government India Act, 1919 are given below:
1. The planning of diarchy system in provinces was faulty:
The planning of diarchy system in provinces was not satisfactory. The executive division line between executive council of governor and the ministers was not clear.
The financial rights were kept with the governor and his executive council. They interfered in the way of ministers. There was lack of harmony between the ministers and public servants. The arbitrary powers of governor and lack of collective responsibility, etc. were main deficiencies of diarchy system.
2. Lack of powerful legislature at the center:
Although bicameral legislative assembly and state council were established at the center, yet neither their formation was democratic nor they were given enough powers and rights. There were many restrictions over legislature and state council.