1. It leads to a feeling between citizens that the sharing of power leads to division of power which makes a country more weaker than it would be if power rested in one hand. 
2. It also leads to misunderstanding between the coucil of various organs. 
3. It also leads to a thinking that it pose a risk to nation's unity. 
4. It also sometimes leads to conflict between two states, two districts or even two cities or locality. 

Hope it helps!