[Marcello]

I find it a matter of focus. Finding stuff about places like Iraq or Afghanistan or nailing things like Iran purchase patterns isn't easy, albeit satisfying (otherwise I wouldn't be doing it of course).
For example did you know that Iran purchased a significant stock of soviet weapons (BTR-50s, ZSU-23-4 etc.) in the early 70's when the Shah felt America had let him down on some issue (some Phantom order IIRC)? Or that the iraqis got ERA for some of their tanks in the 90's ?
At least semi-reliable sources for these things are hard to come by and switching back and forth takes more time than simply concentrating on one subject at time. That being said if the general consensus is that you prefer to wait for both longer I may go down that route, although I can't guarantee I won't develop a preference for one or the other at some point.