I still think agi is very important in fighting. The time taken by a complete slash, miss and recovery is probably not much dependent on agi, but what about the feinting speed, the blocking speed... Alas those values are way harder to measure.
this, agi might not affect the attack speed, but how often do you attack many times in a row?
The most important thing is the time it takes from you release your block till yu hit your opponent, and the feinting speed is very important, too.
If agi affects those things, it is still very important, not only for the wm