Formal choreographic modelling advocates a correctness-byconstruction principle for the development of sound communication protocols. This principle usually hinges on syntactic or semantic restrictions to rule out models that could lead to communication glitches like message losses or deadlocks. This paper explores how these restrictions impact on the usability of formal modelling. More precisely, we benchmark the use of a formal choreographic modelling language designed to support the correctnessby-construction principle of message-passing systems. To this purpose, we consider the formal choreographic modelling of real business processes taken from the official documentation of European customs business process models. In fact, following a steadily increasing trend, the European Union started to use BPMN to support the legal provisions of the customs business process models.