I really can't understand why it is so hard for people to wrap their heads around this. Currently 2x bard setup is best, because their dps, and songs.

Yes. bards do less dps than the other dps classes. IN OPTIMAL SETTINGS WHERE MOVEMENT IS NOT AN ISSUE MNK/DRG/BLM/SMN will all have higher dps. Once you get into Mobility, that is when Bard takes off. BLM and SMN cannot keep casting while trying to avoid mechanics, so their dps is significantly reduced. DRG and Mnk pull lower dps because of the same reason although their abilities are instant. People are complaining because Bard's mobility and utility, followed by high dps makes them an extremely versatile and much needed class, over most others.

The only reason why most raid comps take monk is because of their low cooldown Silence. Other than that, Monks wouldn't be needed. I have a monk at 45 at the moment and a warrior at 50, and both classes are subpar when it comes to endgame.