I figured Byrth or some other career Dancer would write the game-feedback equivalent of a doctoral dissertation regarding Job Ability Delay and the sucking thereof, but I've missed that if it happened. So, it's time for me wake up still drunk and scrawl "Job Ability Delay gives me sadz! P.S. i liek butts." on the wall in store-brand ketchup!
Here goes nothing:
"Job Ability Delay" refers to the delay inflicted by using a job ability. To be specific, this is one second of inability to do anything, then one more second of not auto-attacking. The former isn't the issue so much as the latter.
This is an issue because it is actually very easy to have an auto-attack delay only slightly above two seconds, and because it is very possible to have an auto-attack delay lower than two seconds. Fortunately, most Job Abilities have a relatively large benefit and a relatively long recast, making them worthwhile even if they interfere greatly with a single auto-attack round.
The real problem arises when certain jobs must use Job Abilities over and over for forever and ever. Job Ability Delay is very detrimental to the auto-attack rate of jobs that use Job Abilities frequently such as Dancer and Puppetmaster. It may have a similar effect on Rune Fencer, if the currently planned recast of the rune abilities is any indication of how often they will be used.
No job that used Job Abilities almost constantly existed at the time FFXI's core stuffs were made, and delay reduction was far less common at that time as well, so it's not hard to imagine how this issue could unintentionally arise.
If it is not possible to eliminate Job Ability Delay, please address it in some way that is possible.
P. S. I like butts. Big butts. I have included this information because I will not lie about my fondness towards big butts.