An important requirement for our business is the possibility to view the subprocess (i.e. assigned process model or EPC) in the model. Similar to BPMN where you can collapse a subprocess and see the subprocess in the model (see print screen below). This is a very powerful feature, but BPMN lacks the functionality of an EPC. For example, it is not possible to link a risk or KPI to a task.
Therefore it would be extremely useful to have this functionality (the sub process function with collapse and expand possibility) also in an EPC.
I created a feature request (#03644) in Brainstorm for this. Like this feature if your business has the same requirement!
Example in BPMN.