And thusly Kuwagami brings us unto the Bizzaro MMO-world; Where players like to do inefficient actions for the sake of the community.

Now to put some background to that. I know where you are coming from, I do understand your arguments, because I used to have the same ideas. But when I moved up into harder raiding and started to watch the top guilds; reading their blogs and watching streams, I learned a single solitary fact.

MMO Players are not gamers in the normal sense. We don't play games, we play spreadsheets with a very pretty GUI.

What does this have to do with Support classes? The top level players spend a exorbitant amount of time doing theory-crafting, so much that "hardcore" players may spend more time outside the game theory-crafting then a "casual" player may spend just having fun in game. This math determines how they play the game. This in turn effects game balance on the meta-level. Look no further then how quickly Ramuh-Ex with Titan-Egi was embraced by the community. This creates a host of issues that we have seen on these very boards.

If they increase damage done by a greater number then the dps role that they filling, they are mandatory.
If they fail to increase the damage done by a greater amount then the dps role they are filling, they are benched
If they reduce damage taken by a great amount then a healer can heal, they are mandatory.
If the cannot reduce damage by a sufficient amount to reduce the numbers of healers, they are benched.
If they can do both, they are mandatory.
If they fail at both, they are benched.

The moment a Support job breaks one of the conditions I set, it comes mandatory or abandoned.

It is a binary view because it's a binary decision. Either a job is taken to a raid or it has to ride pine. You cannot take part of job to raid and leave some of it behind, it's all or nothing.

I know my chances of convincing the OP and others are slim. I accept this.