The problem in FFXI was people gathering huge amounts of mobs from all over the zone for Astral Burns. However this could never happen in FFXIV as mobs return to their territory so you could never gather these large amounts of mobs.

That makes this extra restriction of only pulling 1 mob at a time in FFXIV ridiculous, the amount of mobs that could be gathered and AOE nuked would not be game breaking and it would also only be worthwhile if they were near enough to your level to yield SP in which case if you managed to pull 10 of them they would kick your ass.

I really can't see why we can not be allowed to engage a few more at the same time, especially as they give us a whole load of AOE moves which seem pointless to use at the minute.