you never needed 8 warriors with 4 T3 .... We never had them and we killed them without ProbsA lot of what was "hard" in vanilla was ridiculous gear grinds for resists or in the case of 4h getting 8 warriors enough t3 so taunts don't miss in addition to them being hard. Imagine if lady sinestra had some ridiculous rep grind that took months to start crafting gear and it was hard on most servers to actually find hardcore people, and then you needed to have your tanks in 4/5 t11 but it was back to random drops with no badge gear or free loot...she would have stayed up for months as well as guilds that are even to her would not have a chance.
The actual hardcore raid scene then was not nearly what it was today with the refinement of tools and addons and such to compare it to the scene of today.
Guess what if you took away the gear cockblocks of vanilla raids and magically wiped some top guilds memory of the encounters mc, aq, bwl, and naxx 40 would all be clear within a month given the current gearing rates.