With that system, 8ppl party may win more exp, killing harder mobs, and the 4ppl parties may gain less exp, killing weaker mobs. Everyone may look for a bigger party If they have time, or just the 4ppl to play a few hours.

It seems a good thing to me.
Anyway, there will alway be levequests.
Exactly, they have the system to impliment this. Be expanding on this system a little they can impliment a game which is great for all players. casual, hardcore, or simply curious about MMO's.

The leve system isnt a joke, it (like all ffxiv) needs some work tho. like you suggested, splitting the party allowences gives players alot more opportunity to fine-tune their gaming experience

Kimiko x