I generally agree with you, I lag in 18 man dyna so much to the point that every action and macro swap will take 1+ sec, that seriously hinders performance and enjoyment. By design, alliance content is horrible itself.
That being said, from community perspective, I still think alliance content is good for the community.
FFXI endgame has been favoring small groups for very long time. Many group that I know of, has minimum members for max gain per merc or run. It's very common to see an endgame LS with core member of just 9 to 12 people and several alt. They don't accept any new members, except people with multiple top end jobs, alt and multiple REMA.
On the other hand, groups that accepts more lesser geared members and run events at 18/18 got punished heavily with less drops. And it has been that way in past 6 months.
I don't think it's fair in any way, personally.
Dyna has been out for over 6 months already, and multiple mid sized groups basically farmed their ass and made a lot of money by keeping the group lowman and BLU burn all things. They completed +3 at much faster pace since every members got more drops. By comparison the bigger group that had to go 18/18 due to the size of LS had to farm drops at much slower pace due to so many people needing clears on different jobs.
Now that wave 3 is out, it's basically the other way around. Big groups with tons of manpower got more advantage, and that's quite fair for people who struggle to include more people per run.