In the beginning of the PvP re-work everyone complained about WHM and SAM limit break. Although there were some slight nerfs to WHM, overall, people improved and became aware of the easy gimps. Then came the complaints about SCH, DRG and SMN. As players got more experience they then learned how useful DRK and and AST were and now we are complaining about these jobs.

Could it be perhaps that not the majority of games you lose are because of 2-4 friends playing together and instead because players, overall, are becoming more experienced and aware of the best advantages and scenarios to press their buttons?

If they removed the ability to que with even a single friend, I feel like complaints would continue pouring in to nerf whatever job combination experienced players come up with. From the devs point of view, it seems like a lose-lose scenario where we end up with no ability to que with any friends and bland jobs that cant do much of anything outside of a narrow range of damage/healing that every job is capable of.