On another note, I hope cross-DC duty/party finders can be implemented in the future.

Already PFs are hollowing out even on established DCs such as Primal and Crystal when it comes to raid content as everyone is travelling to Aether instead (I believe the same thing is happening in EU and JP DCs as well). If this phenomenon is left to continue, it is going to lead to further stratification among the various DCs and congestion whenever there's a new raid patch where everyone would just congregate into a single DC.