As for the potential decrease in party size from 15 members to 8, I'm neutral on the subject. However, there are many party features from FFXI that are absent in this game that we desperately need. To list a few:

-When viewing the party member list, give details on each member's rank, physical level, and location, regardless of whether or not they are in the same area as you.
-Implement a search feature akin to that used in FFXI, in ADDITION to the recruit feature in place now. Meaning, allow players to conduct a custom search just like FFXI, where all players on the server who meet the search specifications are displayed. When the search finishes, display all the information listed above.
-In the party member HP/MP display module, also display each member's location if they are not in the same zone as you.
-Introduce a "seeking party" function similar to FFXI.