What is exactly a Chief of Army staff supposed to do in an economic committee? Sharing economic intel is a job for other departments, including the ISI.
Could you please give one example of military being involved in economic matters in a developed society? In our case problem lies in the history. Our military is too ambitious and has this "holier than thou" attitude towards rest of the society. Though a vast majority politicians leave a lot to be desired but it doesn't mean that we keep handing over political spheres over to military. Army is already busy running a massive economic empire in the name of soldiers welfare.