Been running Ridorana Lighthouse the whole week and...

[BillyKaplan]

Maybe I am just an odd ball, but as a tank I personally never understood why in a PUG I should get better chances over another player for getting a piece of gear

Then you need to reread my post because I listed some examples. For starters, the other players might not have the job unlocked, not to mention in a relevant level. You, however, do, proof of being on that job while in the instance. Why should they be given the same right to roll on it as someone who'd actually need the piece right now?

it was a group effort

Was it, though? Really? Healers in particular have it rough on the first weeks of 24-player raids. And you're saying that the self-same dps who spent most of the time dead has as much right to roll on the healer gear that dropped, despite it being immediate upgrade for the people who kept the party alive? Fair numbers wise. Otherwise, no, it's really not fair.

so in my eyes it is only fair in the entire group has a chance to roll on the item at the end.

And they do in every other piece of content - assuming the people with Need roles did not use them so the Greed roll initiates. It's not like people never manage to Greed anything with the Need button enabled.

Sure it might not be fair to individual players, but it is fair for the group as a whole

Ok see if you can follow this concept - a group is made of individuals.

Don't really see how all-greed is any more or less fair than fighting 7 other people for a shaft in Sigma for four weeks - only that Ridorana takes awhile and you can't focus a certain boss.

Like you said, it's much shorter. There can also be a debate about difficulty if only due to how many people are in the instance. Then there's the fact that in Sigma you have much less rng to fight because the drops are currency - you don't have to run it a billion times only to get to the last chest in the Lighthouse and see that your caster chest piece didn't drop. Again. And if you disband on Hashmel while you needed a top piece, which only drops from the 3rd and 4th chests? It's not even comparable when you think about it like that.