Time=/=Difficulty. A huge majority of the stuff in FFXI was not Difficult, it was time consuming.
Hell, I soloed Rank 3, 4, and 5 because I could. They were easy. The only difficulty I had with any of them was bumrushing Castle O past a bunch of true-sights to trigger a cutscene. But even that was easy with Whm/Nin, Stone Skin, and Utsusemi.
Events that require more then one person are even easier, the only thing difficult is getting the people together, and when I played XI I was in some of the larger social LS's which made doing so really easy. Hell Sunday nights was Delkafutts night for us, anyone who needed it I'd run them up to the 10th floor to get their key and get their cut scene in the basement.