Those 8 player story duties are like that because new players complained about having the duty cleared by the other players before they finished watching the cutscenes. TBH I kind of liked it better that way back then. Even for the new players the cutscenes weren't forced so they could have skipped them and watched them later if they'd wanted to. You could even argue that the new players don't contribute much to the boss fights unless both tanks or healers are new simply because the people running these on roulette are severely overtuned gearwise even after sync compared to the item level expected at the time the quests were added. I think Darklight or base relic was endgame back then... it was a really long time ago lol.