I could only guess the reason why BLM didn't get the same treatment as PLD. Which is that it is easier to keep buffing BLM until they're the top of the dps charts since they're a "selfish job" and they're suppose to be at the top of the meter. (Second reason being its Yoshi-P's job and he doesn't want the 2 min meta taint on his favorite child either.)

You can't really keep buffing PLD or some baldy will get angry WAR isn't the best tank at everything.