Not sure this is true, but point taken. I think they still are entitled to the spells however, since they fit the spells in this game. You may still disagree, but I think that Black Mage should get the flavor part of the spells, while Dark Knight gets both the utility and flavor.
SE pretty much said no to this earlier. I think it has to do something with mob resists. Stun II would be more likely to be implemented, but I think SE might want people to have to rely on multiple people for stuns, which could be potential hassle to implementation.
Currently Dark Knight is the king of Dark Magic already. The problem is that they are like a king with no money to run their kingdom, no army, and their kingdom is made up of cardboard boxes. While it might occasionally do really cool things, it hasn't scaled well as the king grew out of childhood.
Anyways, the job trait increasing the proc rate would only really be a reality if there was a reason for it - either merits or another job like Black Mage having the spell too (imo, such a merit category would be useless). As for a Job Ability, who knows... maybe Scarlet Delirium would get it, or maybe it would be tied to something else a little more known for being useful.
Ultimately, increases won't be very much, and the proc rate will be abysmal - this is mostly a flavor spell stuck onto much needed utility for Dark Knight.
-
All that said, regardless of BLM getting the spells or not, I feel that Doom should come before Death. It just feels more right.