I find it non trivial to split a team in two independent teams. If the two teams have to coordinate a lot and work on the same code base, is there still two te

I find it non trivial to split a team in two independent teams. If the two teams have to coordinate a lot and work on the same code base, is there still two teams? To be independent, they would need to work on functionnaly different parts of the project. Not all projects have several independent parts, feature-wise. What do I miss?