As a DPS you will always be a passenger in the group.
I do not agree with you, not by a longshot.
Actually for SWTOR Sydexlic is correct. FP's are pretty much a two person party with the other two slots fillable for what ever cc's/damage dealing meat heads you can find. And I say this with an Arsenal Merc main. You do not need a puller because you are not camping. There is no decidated buff/debuff class nor is there a decidated mez (cc) class as everyone has those abilities. Bascially all you need is a Tank to keep hate, a Healer to keep the tank alive and two other randoms that can spam attacks and/or cc's over on adds. Don't beleve me try playing EQ, FFXI, or even Rift somewhat and see what you need for a party makeup when running a raid or a dungeon.