BPMN — Business Process Diagrams

I've been checking the BPMN for the connections, My question/comment is that why the spcification didn't introduce a type of connections that compines both Message and Flow (A connection that does both functions at the same time, it models the sequence and also models that data/message is being passed from the source object to the target object). Without having that type of a connection a diagram will contain many objects connected by two connections (one for the sequence and the other for the message) which leads to complexity in the diagram layout.

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