Concept for a Magic Melee DPS

[Archwizard]

If the game didn't force you to use its melee combo to gain access to your strongest spells, then RDM in FFXIV would be a pure caster with no reason for ever using melee abilities. It's barely a red mage at all at that point and its melee abilities should absolutely be expanded upon.

I mean, yes. A lot of jobs would rather fall apart if you didn't do their proper rotations. Dragoon would hardly be a Dragoon if you ignored its rotation and just spammed the ranged attacks. RDM isn't special there.
Personally all I need in a Red Mage is the mixing of Black and White Magic. The mixing of melee is cute, but it was rarely something the Red Mage could capitalize on, while Chaincast effects gave Red Mage a real niche.
I wasn't suggesting taking the melee portion away from RDM. To the contrary I said there are abilities untouched by Red Mage that could be taken by any other job. Are we going to block all future melee job suggestions, or at least the ones with spellcasting, until RDM gets more melee skills? We both know that would be ludicrous if it were any job other than Spellblade, but if the two jobs have always been distinct in the past, why argue similarity here?

Tell ya what, I'll engage with that line of thinking for a bit.
Your goal is a more significant contribution to RDM's damage from melee.

Presently we spend about 40 seconds-ish building up to the melee combo (without Manafication), give or take whatever amount of Reprises we cast. As our spells generate more Mana (such as, say, adding Scorch), the time to build the combo goes down while the combo itself retains its static cost, thereby increasing our time in melee.
However, each additional Enchanted melee skill comes with a Mana cost.

First thing's first: what is the ratio you're looking for, of casting to melee? Is it 80/20? 60/40?
I surely hope not 50/50, we'd practically spend the entire fight at point-blank. Last week my level 70 Dragoon had more HP than my RDM has at 80, and its survival tools are free oGCDs -- half the reason we only spend 10 seconds a minute in melee is because we're just so damn squishy.

What's the gameplay loop you intend for RDM with that higher ratio? Surely if you're arguing that the addition of an unrelated melee job will impede RDM's progress, you must have some ideas in mind of how they'd specifically work.
Will there be branching combos? How would these changes affect the Mana economy? Or do you just want to redo the entirety of Mana altogether -- in which case, why not just make another job?

How much of what you're saying is specific and structured criticism, versus nebulous and irrational fear-mongering?