@Ilúvatar "Some classes have a very difficult time with this requirement." - I don't know about that. Since the current expert requirements have been implemented, we've gained hugely powerful tiers of gear (and even gained a new difficulty level, Ultra Hard) - so being tasked with clearing two Extra Hard quests, with even baseline15* weapons (which were recently buffed, I might add) isn't exceptionally difficult provided you have a grasp of your class's invincibility/guard frames and understand which situations to use your various offensive options in.
It is still very difficult to meet the current JP expert requirements when you mainly play TE/HU. I eventually gave up and cheesed it with ET.
Anyway, to the point at hand, I think the expert system is fine (not perfect, but passable), so I won't mind seeing it in NA, as long as they start with reasonable requirements.
To those saying it is unnecessary, it matters more for some EQs than others. For some future content, you will really want to play with people who know what they are doing.