Final answer:
The ESL project was unappealing due to its discord with existing football governance and its perceived threat to the game's inclusive nature, much like the challenges faced by the EU when aligning diverse member interests.
Step-by-step explanation:
The question pertains to a comprehensive market diagnosis of why the European Super League (ESL) project came across as unappealing to its stakeholders. Evaluating such an ambitious project within the context of European unity and international football governance requires understanding the complexity of European Union (EU) and supranationalism. The EU itself, facing various challenges such as enforcement issues with member states, Brexit, and internal economic pressures, exemplifies the difficulties that arise when attempting to align diverse national interests under a unified umbrella. Similar to the initial backlash against the ESL, the EU's experiences reflect the obstacles in harmonizing different stakeholders' interests within a cooperative framework.