Right here your talking within specs,
Healing commando plays nothing like a gunnery commando. That's through talents.
You cant compare it with "a warrior doesn't play like a paladin, what's your point?"
That actually would be like me saying in want my warrior to change to a paladin. They are both melee dps, both can tank, one can heal and the other cant. Similar to these games AC right? they must be a AC from "Fighter" or something.
Anyways. The only thing that people like you will succeed in doing is just chosing your advance class at character selection. Which this I REALLY REALLY hope they do eventually, to stop post like these.