Why does it have to stack up against other support, When it stacks with it?
The fact is RDM has no role currently, and the only viable option is to enhance our buffing and debuffing. No one is going to invite a RDM because it can nuke/heal/melee if they wanted to invite us for that we would have a spot in a party. Instead they bring WHM's WAR's and BLM's.
The skill set of RDM dictates that the only viable position we can have in a group is as a support mage, using our secondary skills to fill in the weak spots in a party while we provide said support. Until our buffs and debuffs are actually useful and clearly better than WHM, BLM or /RDM, /WHM, there isn't a spot for RDM.
It is well and good to ask for new things and other tricks, but when the foundation of the job is rotten you don't throw more shit on top hoping it will magically get fixed. Until the foundation of the job is fixed then nothing added on top will take.
SE needs to determine what they want RDM to do. What role it is supposed to provide to a group, and quite honestly the only one that makes any sense with the current job distribution is buffing and debuffing.