Having greater or lesser MP economy isn't a material advantage, granted. It's somewhat helpful for sloppier pulls, but in the grand scheme having the best of the best MP recovery is moot.

That's not what the argument is.

WHM doesn't just have the worst of a list of viable MP economies. Its MP recovery next expansion is going to be so low that it's going to bleed mana just keeping up its ABCs. Glare is the classic example, because spamming it is cheaper (MP wise) than GCD healing. It's a great hypothetical, because it represents the lowest consistent MP expenditure over time. WHM is going to run out of MP about halfway through an Ultimate fight's timeline with the Thin Air changes. That's -bad-.

Of course it goes without saying that yes, while MP isn't a material advantage, it's just funny that White Mage can't even boast that. It's got lower damage. Less free healing. Less utility. It's just a numerically, factually inferior job to the other healers for *no reason*. It doesn't have anything that makes up for these weaknesses. Even its personal damage is dumped all over by the other healers' buffs.