Well, back when Friday used to be a holiday. It used to be like Sunday. People were lazy and most stayed at home instead of going to Jummah prayers, which was the whole point of having friday off. Then Nawaz Sharif decided to make Friday a Half-day ( after 15 years, it is no longer a half-day at most places ), and Sunday a full holiday. So instead of 1 day off, you got 1.5 days off and the cherry on top was that more people started to go to friday prayers.
On an even more important note. Having Friday off is NOT ISLAMIC; The prophet did not do it and his companions did not do it either, you wont find anything in hadith and sunnah that suggests Friday or any day for that matter should be off. There is no Islamic concept of any days off. A Muslim rests when he dies.
Allah knows best.