Because a lot of the WAR population now consists of people who started in 3.0 and don't know how WAR works, only that they do a lot of damage.

Isn't this old information? I thought this was common knowledge, and I don't even main WAR. Then again, my group on A5S has the PLD pull for some reason... ¯\_(ツ)_/¯
A5S is actually kinda weird since the MT gets knocked with damage down stacks and then gets stunned for like 10s. I wonder if the WAR pull would still be optimal there, especially with the reduced damage the boss takes during that time. Hard to say.