Square dun goofed when they designed this game's content around a 4-player 1-2-1 (tank-dps-heal) composition, instead of the far more sensible 5-player 1-3-1 composition, or the even better 6-player 1-4-1 arrangement.

I feel that queue times would be significantly better if party size was six. Single-party dungeons would have twice as many DPS per instance as our current 4-player parties do, which would greatly reduce queue times. Simply increase the "Light Party" size to six and the "Full Party" size to twelve. Endgame Trials and The Binding Coil would become 12-player dungeons and Labyrinth of the Ancients could be tuned slightly downward for three 6-player groups (raid size of 18) instead of three 8-player groups.