Theoretically speaking it makes sense. More provinces allows for more micro management and more regional and local focus by a central authority. This certainly is the trend internationally speaking and the vast majority of countries have far more provinces and special administrative units as compared to Pakistan. For example the average number of people living in a province/region in Pakistan is
220 pop /8 prov = 27.5 million per province (counting AJK, Islamabad, FATA and GB as separate territories).
In contrast countries with similar sized populations to us have far more provinces, such as
Brazil
208/27 = 7.7 million per province
Nigeria
198/36 = 5.5 million per province
Indonesia
264/34 = 7.8 million per province
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From above it can be seen that our average population per province is around 4 to 5 times more than the international average. Personally speaking I believe it would make much sense to divide the country into provinces as drawn above so that regions that have thus far been neglected get attention from a central authority. Having said that politics in Pakistan is dirty. Dividing up provinces like this will be used by politicians to make the populace emotional about them losing power on the national stage. Ethno-centric parties will deride the changes and marshal support from the masses in their provinces by claiming other regions will get more unjust power due to the impending changes. I therefore would not recommend Pakistan to do this in the current stage unless we have a federal government in power that is popular throughout the country. The chances of that happening at the moment are slim.