Jesus didn't have over a billion followers, the sacraments had not been fully developed, and the "church" after His death were Jewish-Christian until Paul and other Apostles/disciples established churches in other areas of the then-known world .  It is kind of like the development of the US since the first settlers stepped foot on the continent: you wouldn't compare us to them for models of how to run and manage the US, would you?  Please, let's stop with these notions that somehow the Church, being so huge and literally world-wide, is supposed to be the size of one diocese.  The issue is about how effective each dicastery is in service to the rest of the Church and to the Pope (the curia is his "cabinet").  +Francis has, along with his cardinal advisors, already trimmed a number of the offices of the Curia, appointed new prefects, and redirected their vision from self-serving to service to the Church, particularly the poor and needy.  It is one of the biggest organizations on earth.