In my opinion, FFXI NM drops were a time sink that didn't need to be. Then again, the items they dropped were indeed useful for a long while. Ex. Okotes lvl 34-70 (+)

The longer spawning NMs should drop equipment for more long-term level range. Perhaps for a required class instead of optimal rank so that the effects last as long as Rank 50. This idea benefits the Hardcore gamers.

The NMs that have a short re-spawn period should drop items that will last no more than 5-7 levels and have an optimal rank instead of class requirement. This way, any class can equip this item and will benefit the Casual gamers.