Why I don't think Powerleveling will take over for groups.
  • Linking is based on party level (the party that claimed) so you will get no linking/linking bonus if you are underpowered for the mobs you are fighting (someone else is fighting for you)

    Inconvenience
  • Player being powerleveled has to claim the mob first in order to receive the xp
  • There is a 10 level above the "power levelee" which means they won't be able to get more than normal capped XP.

Power leveling will happen, it might shock you to learn this but power leveling has been occurring since day one of this game. First through the DMG/healing system, then through guildleve linking (which you could just set someone on follow it was so idiotically simple/repetitive), and now with... guildleve linking, power healing, and simply having a slightly higher level in party who themselves gets a penalty but can effectively "power level" the rest of the group.

I'd certainly rather have power leveling, something which XI grouping co-existed with for years than a level sync system which effectively killed that experience for the majority.