To understand that, I will try to make it more simple that how tribes works.
You know that there are many tribes in FATA and mostly follows the Jirga system but to the some extent still there is vacuum and even sometimes we hear about tribes attacking each other. The problem arises when the A is not agree with C and D is opposing the B in some cases whether based upon property etc conflicts. So for the same reason, sometimes C & D gangs up to oppose A & B which results in local killings and outlaws. On the same equation, if in current situation it is granted with a room to separately govern themselves, vacuum would still persist with all those tribal opposition things and will be back to old scenario being outlaw. So to address the same situation, firstly it has to be administered by already settled province having a elected government. By this step, the tribesman will be learning to follow the law of the state and obey. In-case of separate province, these tribes (as quoted in example above as A,B,C & D) will again come facing each other with their own difference and will gang up against each other. While on other hand, when there will be a center to complain (the provincial government of KPK) these conflicts will minimize to none.
As soon as they have learned and understands the democratic values and election chemistry to vote, there might be a chance to let them lead their issues separately but such separations just based upon ethnic differences are causing more harm to the country in whole. As
@Arsalan quoted, the Saraiki, Punjabi or Hazarewal based separate provinces are like cancer that will initially wouldn't be diagnosed. I personally pity, while looking at the current divergent created by these so called political parties, dividing the people on ethnic basis yet depriving the existing provinces. Such divide based upon ethnic basis should be stopped first and we have to pay more attention to an eligible, competent and educated administration system. As soon as we have such administration, that can lead the people without any personal, ethnic, ego or self luxury goals then units are not more headache for us.
Unfortunately, we are lacking the such competent and educated administration breed here. Let the FATA attend the school of a provincial system first and learn then there will be chances that how they can lead if there is a separate province for them. Right now, what they are going to lead and on what basis, I mean, they have no idea w.r.t modern industrialization, agriculture, administration, government ruling and production etc but are intact to more the local tribal system that too without any sources to bear their own expenses which would ultimately burden the center with more expenditure. As soon as they are connected to KPK, the budget of KPK need to be raised and grants should be done timely so the reform would work under the supervision of a running provincial system.
