The major characteristics of a presidential system is that the Executive and the Legislature are completely separate. They often work against each other, hence checks and balances. It is not unusual for the president in such a system to lack control of the legislature (less MPs).
In Kenya, the Legislature and the Executive are more or less one and the same thing, and we function more as a parliamentary system, albeit with shortfalls. In a parliamentary system, the head of state is different from the head of government, the latter usually designated as prime minister, picked by political parties.
Since, in Kenya, we behave more as a parliamentary system, and have failed to live a presidential system, I support the need to change the system to conform with a typical parliamentary system.
Majority of governments in the world are parliamentary and the least system used globally is the hybrid system, whch apparently Kenya applies defectively with heavy bias towards a presidential system (that is why you see Cabinet secretaries engaging in political campaigns, a concept alien to a presidential system of government).