And I realized something while leveling it up to 22.
In ffxi they put in level sync. Where you designate person A in the party.
Everyone else is deleveled to Person A's level. And everyone earns experience.
This lets you party with friends who are lower level.
The scary thing is this means it would technically be possible for someone to level up to 75 by only going to one zone and partying over and over with people.
I could see forcing someone to do this as a form of torture.
(Putting aside the problem with level breaks)(For those who don't know ffxi, you need to do quests to unlock levels above 50.)