There are many reasons paper money still exists in all countries, least of which is currency is not currency unless it is available all the time, and power shortages will hinder that universality even in countries that have gone very digital like china. People still keep a small reserve of cash, just in case.
watch the following video where the situation that develops when even a small amount of money is not available on the spot. (P.s. if you watch to the end you will learn to be very careful if you travel to china as a foreigner, seriously)
and this video shows a detailed look at the pros and cons of a digital currency; also in China
Pakistan has to get the macro-economic management of governance, tax collection, and barrier free investment into industries before it can aim to be a major economy. We have a lot of labor, and raw materials. we should focus on developing the best we can, and let the GDP growth numbers fall where they may.