Further to Sharks post, it would be nice to be able to have a narrow focus at times, and it's an idea that has been discussed in the past, but Citadel is really trying to capture the period on a 'larger' scale, that is, encompas Europe and the Middle East over a longer period of time. The problem with focused mods is that while you can dedicate much more to the details of the focused period/region, you miss out on those 'global' events (well, global being the known world) and interactions. Besides, the large mods offer a greater 'what if' setup - a mod focused on the 100 years war will allow you to live the 'what if' of France being totally conquered and help by England, but a mod such as Citadel lets you play that 'what if' on a different scale, how would it impact on global relationships and the balance of power, how would the Pope react, etc.