Here's the thing.

I'm all for partying for exp, if it's not a required thing. It's a great experience that Zaaku, but he misses his own point. He enjoyed the experience because he subjected himself to it voluntarily, to avoid the alternative which he did not enjoy.

I could write a several paragraph page about my routine on Leves, on how I enjoy the fact that with each new ability I get, I've the time to experiment on it without the stress of worrying about people's concern's for XP/hr, or how I get to not worry so much about grabbing gear for my level because of the continual gil flow I receive during Leves, or even the bypassing the hours waiting for enough of the right people having their flags up for partying, etc.

Someone else powerleveling has no impact on that.

If anything, that desire to party up for exp, should be a call for SE to implement Level Sync. It was a great invention in FFXI, and one of the few things I encourage the FFXIV developers to take straight from FFXI.

This way, Zaaku gets what he wants more frequently, with less stress and nobody else's playstyle is effected.

Well meaning people can call for the wrong things and end up with a very poor result at the end. Closing up the plvling loopholes just means another one gets made later, or more stress gets placed on the players who come here for a low-stress environment.