One of the problems with FFXIV is that for endgame a full party of the same class sometimes can defeat everything. I was thinking about: why not give bonus to these partys who are not 6 warriors 2 healer, 8 BLM, TPburn, etc
why not to modify light and full party bonus to promote parties with diferent setups?
For example, if you have more than 3 BLM in your party, you lost your full party magic accuracy and magic potency bonus, and the same with full warriors party, etc.