We have seen the creation of extra-constitutional positions in the government, such as the Chief Executive Officer position occupied by Abdullah Abdullah, which was done at the behest of the American government. Additionally, bargains and compromises that were brokered by the American government in an attempt to create more a more inclusive government, reduce corruption and heal fractures among the political bloc that once supported Hamid Karzai and the American presence has failed to achieve those things. Corruption is still the dominant feature of the Afghan government, and the political support for the rule of Kabul has deteriorated and splintered by the corruption and the machinations of the Karzai and now Ghani governments.
Most importantly, the political process, by being so corrupt, by seating successive governments that won by fraud and by disenfranchising various political communities, has alienated many, many Afghans, and not just those Pashtuns who ally themselves with the Taliban, from the government in Kabul. This has allowed for greater support for militia commanders and warlords outside of Kabul, as well as the Taliban, and has allowed the war to progress with no real hopes for reconciliation, negotiations or a cease fire any where in the near future. (By supporting and growing a kleptocracy, a system of have and have nots, that system has by its nature and necessity produced more people out of the system than people in the system every year. This causes resentment, grievances and a desire to share in the spoils and gifts of American occupation that leads to greater violence, more political chaos and a dearth of hope for the future).