Back in the day, Blizzard put all the NR gear on world bosses with the intent in the months leading up to AQ or attempts on huhuran would be enough time for several guilds to acquire enough NR gear for the soaking on that fight. You can see this reflected on the loot tables for the world bosses with NR drops being shared across multiple bosses.
What they didn’t account for is the world boss gatekeeping that happened back in vanilla and continues in classic wherein 2, maybe 3, guilds across both factions are going to consistently claim world boss loot. It wasn’t until they released Naxx that they realized the vast majority of players had no access to the NR gear that was required to progress AQ at the time, and so they implemented catch up crafted gear.
It’s all pretty dumb, but the lack of these items is in line with the vanilla AQ experience. You’ll notice that they didn’t make the same mistake with FR gear for Sapph.