Red Mage? Favoritism? I'll repeat Raydeus' sentiment. LOL... just... no. Almost everything White Magic related added to Red Mage (sans merits and enspells) has been added to White Mage thus far. And they are still getting Tier 1 versions via Red Mage subjob.

White Mage doesn't need any native MP restoration in my opinion. Orison Pantaloons +2 is White Mage's bread and butter. With a great potency/healing/MND set (varying amounts based on cure, cura, or curaga), a lot of their cures for party maintenance are practically free. At the least every White Mage should be switching to an idle set after every cast. And Wayfarer's Robe Set adds Refresh+3, so every WHM should have that at bare minimum to recover while they can't rest. Veteran White Mages idle in Refresh+7 or higher.

With support job MP assistance from Refresh (RDM), Sublimation (SCH), and if possible to gain TP has some of the best MP recovery WS selections between Spirit Taker, Mystic Boon and Dagan. Also White Mage, unlike DD's and tanks aren't required to eat food, support pets, buy ammo/tools, etc. So you can drop some money on coalition ethers, vile elixirs, etc.

The only MP restoration I could see be natively added to White Mage is changing it so you can use Devotion on yourself. Anything else would just make White Mage more than a powerhouse it already is with all of the ridiculous amount of tools it has so far. The job has to have some disadvantage somewhere.

Rune Fencer is also not the counterpart to Red Mage. It is a tank created a decade after Red Mage with no similar job roles. To say it's a counterpart and compare their spell list, denotes they have similar functions. It's like saying White Mage is the counterpart to Paladin.