I can agree with most of these sentiments as well. Much of the older content really was not super hard, just required more time to eventually beat out the RNG and also other lotters in the same group(s). However, some of the events are specifically tailored to players who had to be decently geared to obtain good results. Sure, one or two people could be sub/below par geared for old 75 Einherjar, but then everyone else pretty much had to make up for their poor gear by being very well geared themselves (after all, it was content based around killing many many mobs AND a Mega Boss; Odin just requires decently geared ranged attackers, and/or BRD rotation of players). No poorly geared or prepared alliance ever beat T2 and Odin chambers of [75] Einherjar, and many instances of this happening was clearly seen (on Carbuncle at least). 3-4 man old Salvage basically required your DDs to be well built to climb and take on everything going up, as well as the Chariots. It also required people to be physically attentive and aware players as well.
No one here is arguing for content that requires the most absolute perfect gear to complete, only the fact that it should be tailored to those players that have geared themselves very well (as well as competent merits). I've stated a number of times that this could be any player, casual or hardcore.
No one is also asking for content that is ever changing and always hard either. We love to have puzzles that are figured out after a specific amount of time. That's one of the reasons why people enjoyed the hell out of Salvage, for example (minus the absurdly low drop rate). We all know the AV fiasco, and no one cares to remember about it, as we still don't know all of the stipulations to the mob in question after 29% HP, however vague or obvious to SE.