Alexander: Who thought this was a good idea??

[Nekodar]

You have need/greed protection on full pieces of gear based on the job/role you are playing so that immediately eliminates some competition. With full pieces of gear you narrow down the amount of people based on role then job to around ~1-2 based on party composition, more if you have more of the same type of DPS. If it's free for all the potential is you have to roll against 7 people every time which lowers your chance of winning.

While you have that sort of "protection" in normal need/greed, you can also end up running it over and over and never actually see anything you can need on in those cases. It balances out.
Be able to need only a few items out of a large loot pool, or be able to need everything from a small loot pool.

[CrimsonThunder]

RNG has no quarter, it favours no one. We plebians can never hope to understand it's divine will.

[Vaer]

While you have that sort of "protection" in normal need/greed, you can also end up running it over and over and never actually see anything you can need on in those cases. It balances out.
Be able to need only a few items out of a large loot pool, or be able to need everything from a small loot pool.

Honestly rolling vs 2-ish people on stuff that might not even drop seems better to me than having potentially one person winning everything and 7 other people in the group getting nothing. I mean this system is great for PF and friends but it's doesn't seem to work well with DF.