The construction of great cities and a flourishing in crafts, industry and art is rarely (if ever) possible without a sophisticated administrative structure that allow raw materials materials and labor to be obtained, transported, and paid for, for example. Feudal kingdoms were no exception, and the twelfth and thirteen centuries were periods in which stronger, more centralized governments with more sophisticated royal administration were evolving in both England and France.
In Western Europe the rise of centralized government generally entailed a strengthening of the crown at the expense of the feudal vassals. (Although Magna Charta and the Oxford Provisions provide examples of how the tensions between crown and vassals could be used to strengthen institutions of consultative government.) Because the Kingdom of Jerusalem in the twelfth century was characterized by absentee kings (two in succession never once set foot in their kingdom) and strong, independent barons, it is often assumed that the Kingdom of Jerusalem lacked sophisticated administration.
It could, indeed, be argued that the baronial movement, which successfully fought off all attempts by the Holy Roman Emperor to impose autocratic Imperial government, was only possible because the administrative apparatus in the Kingdom of Jerusalem was so sophisticated. How else could barons holding fiefs in two different kingdoms have had the time to engage in a protracted struggle with their overlord, defend their fiefs against the enemy, take part in crusades, and still find time to write legal tracts and other scholarly works? The mere fact of being dependent on income from two geographically dispersed kingdoms, made it essential for the leading men of the kingdom to have institutionalized deputies capable of acting in their absence and in their interests. Furthermore, warfare is expensive, and so impossible at a national -- or baronial -- level without a means of maintaining sources of income.