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The main question one might ask is why the design described here should be used. What are the benefits?

Flexibility

First of all, this design is really flexible, similar to the real world the end users live in. When an activity is added to the process, all that needs to be done is add the task to the proper phase and determine its precondition. That's it. In conventional business modeling with activities and flow, adding an activity is much more complex. Most likely the activity can or must be added in more than one part of the flow.

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Understandability

Secondly, this design is much easier to read for business users. Flowcharts tend to be seen as 'technical' or 'IT-like', although that was never the intention of BPM. A process diagram containing phases with activities is much easier to read by business users. Instead of being responsible and accountable for dozens or even hundreds of process diagrams containing complex flow, business users are delighted to see their processes narrowed down to a few simple designs, where the complexity is not in the process itself, but in the activities. 

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