I honestly cant understand you complaint regarding group compositions. If all instances was doable with any group people would rush through em in no time.
If the flashpoints where easy enough to be done without a propper group (Healer, Tank and DPS) they wouldnt be any fun imo. The fun thing about a instances/raid is that every person in the group has a role wich me/she must fill out, for the group to be able to complete it.
Would there be any points in have multiple specc options, if you could do all the group related content with DPS'ers only?
Im fine with those things becoming important for the endgame raid type content. I just dont think they enhance the game when it comes to the instance runs people do daily. And i definitely dont think it enhances the gameplay while youre low level.