Who cares what the archetype is?
o/
Who cares what the class is called?
o/
This game thrives on it's archtypes, it was the primary draw for the majority of it's playerbase, and int continues to be a draw for people. In spite of all of it's flaws and benefits, the one thing it will always hold over every other MMO is that it is THE Final Fantasy MMO.
You think Archetypes aren't important. Take a look at how FFXIV is changing their 'unique' jobs back into those archetypes.
You can debate how 'awesome' (lol) a mage Red Mage is/was, whatever. But you're never going to bat down the desire to have more of the jobs Archetypical role and capabilities, ever.
And honestly, you can easily achieve it without harming the back-line role people have come to enjoy. You're arguing it down out of dislike for the players that desire it and how it differs from your viewpoint. Rather than looking at the entirety of both sides objectively and seeing the easy compromise that could benefit both camps and Red Mage's identity as a whole.
