Your words, not mine... So who's the dumb one here? Also, all of vanilla five-mans were tuned into being leveling content, not endgame content, and were totally doable in questing greens at 55 and onwards.
No, because those were tuned all at the same level of difficulty. You could do the instances in any order and get same quality of gear from all of them. To be 100% honest, Dire Maul was tuned the lowest of the bunch (it was added as level 50-55 instance) while having best gear because it came in last and didn't have any ridiculous shit like spirit on warrior set.
I'm pointing to it because GW2 did exactly same endgame for non-raiders as vanilla WoW had, and is widely considered to be failed experiment from PvE perspective since it lacks any real endgame progression just like vanilla WoW did outside of raids.