Ignoring the fact that was the main thing I hated about FFXI (goddess I still have nightmares about 'dooms parties' - hells FFXIV even makes fun of the time wasted exp grinding in parties in FFXI (in the description for the Smallshell minion)!), way back during ARR's development Yoshi-P specifically stated he wanted to avoid old style FFXI exp parties and move players over to what he termed 'content based exp'. So, it's pretty clear SE considers the old FFXI style of exp parties an outdated relic from an old age.

Of course, nothing is stopping you preforming a party for a dungeon in Party Finder, or gathering up people and doing FATE parties, but you probably won't get much interest for a full FFXI style exp party system I'm afraid.