Unity alone doesn't eliminate the complexity of development, governance and service to the people. They (like many of us in the US) have not directly confronted the logic of their own decision making. So from the perspective of the well intentioned and sincere, these decisions "make sense" in the long run given their method of reasoning.
History is filled with these stories on and OFF the Continent.
I believe it has much to do with fear. They have seen too many of their legitimate leaders (e.g. Patrice Lumumba), who attempted to act in the best interest of their people or Africa, end up dead. Now, they also fear drones, foreign military invasions, bombs, and Draconian sanctions if they even think of acting in their own best interest, not in the best interest of greedy western powers.
This is where unity is critical. If the people of the Democratic Republic of Congo decided to do it alone and kick all the greedy devils out of their country and affairs, they would be squashed like a bug. However, if every country in Africa united and kicked the devils out, it would be a completely different story. Why? The greedy devils are not going to nuke the entire continent because it wouldn't be in their best interest. Sanctioning every country in Africa wouldn't work either. Why? Because all of those African countries would have complete control over their wealth/resources. They could simply do business with each other. The sanctions would be ineffective, a joke. In a short time (about 20-40 years), Africa would be the wealthiest and most powerful continent on this planet. The tables would be turned.
If only they could unite...