4. World spawns rewards I'd argue the best system is a meritocracy which rewards the most skilled, regardless of comparative time dedication. We do not crown NBA champions or Superbowl winners based on how much practice they did, we crown them based on who is the best at the game... determined by the competition.
World Spawns are far from perfect at this... but are much better at it than instances. World Spawns blend a bit of "most time dedication" (in a communal sense; the group that puts in the most hours, when you consider each individual member's contributions separately, tends to have a claiming advantage) with direct competition and skill test (you don't get to wipe and try again, you mess up if someone's better than you they will kill it instead).
Some people legitimately didn't have schedules that were conducive to world spawn systems. However I do believe that, if devoted, anyone could attain almost anything EVENTUALLY from an HNMLS as long as they were willing to put in whatever time they did have to a linkshell. (Except for Defending Ring due to its rarity, you could just plain out never see it drop ever).
More people simply refused to level support jobs to gain entry into an HNMLS because they expect to be able to come in as a dime a dozen DPS/tank (and probably poorly geared at that since your objective in joining an HNMLS is to get gear).
Some stuff, even in games, is supposed to be hard. Shut up and do it. And if you can't, well that's where you rank as a player. Just like most kids aren't gonna get into Harvard, you can't have everyone be the best at a game. When Relics came out, SE specifically said not everyone was supposed to get one. Similarly, I think not everyone was supposed to get Ridill, Adaberk, Dramatica, and D-Ring.
I am NOT advocating that you have to play the game a certain way. My opinion is simply that not everyone deserves top level rewards in virtue of playing. FFXI is like any other game. Go play Street Fighter or StarCraft at your own pace and your own way; the game is there for you to enjoy. But if you don't excel then you don't get ranked into the highest leagues.
There is no shame in that unless you yourself are making a value judgment based on that. And if you are, maybe you care a bit more about your relative position in that competition than you want to admit.