If all classes generated the exact same dps/enmity/heal then this would be the most balanced game in the world and something that I would love to see myself.

Because at the end it will all come down to what playstyle you prefer. Ranged or melee, magical or physical damage etc.

But that's not exactly whats going on in this game or you wont see something like (LF blm for turn whatever). Instead it would be (LF dps for blah blah blah). And that's something that we can only hope to see in the future.. Or at least I do.