When contesting for election The only people that are qualified to run are those forwarded by a political party as there candidate there by making it hard for the people's choice to run.
When a political party is functioning in a country and one among which is on power any other person that those not belong to there political party will be seen as an opposition, that is why you see position being given to people that are not qualified for such position all because they are in the same political party there by causing damage to countries economy.
You were making sense from the beginning of your statement but it seems you lost it from the part I bold in your post. I agree with you that some positions are being given to unqualified people as a compensation for being in the party but it is still much better compared to when there's no political party. Political parties serves as a check on the candidates in their various platforms and even recommend those to appoint when necessary and also reject some appointments if they are not well convinced with it but with no existence of political parties, this check and balance will not longer be there and politicians can misuse such opportunities to appoint whosoever without any recommendations or objection. I really understand your point but believe me, a system without political party will be the worse system especially in Africa continent where Nepotism is at it peak. The existence of multiple parties is the best practice for them to minimize the abuse of power by politicians.
Again, not all appointments are being distributed to party loyalist, there are few appointments given to opposition too to maintain balance of power. The problem with this political party is that, politician has created enmity among themselves in different parties and make it look like a rival. It's not suppose to be so, in fact, opposition can also be a contributor to a better nation by offering ideas to party in power but they choose to make things worse in order to take advantage of the situation and market themselves.