My poor word choice definitely did not help my question get across. I figured out what you said through testing, which I did before I posted this. I just thought It didn’t make sense because since those types of abilities are also affected by duration, why fleetingly expertise would have any affect. But I figured out the reason for my confusion was because it appears that duration has less of an effect on these kinds of abilities than efficiency does. But that still doesn’t explain why with only a maxed streamline and Fleeting expertise on, it only counts the efficiency and not the duration. Oh well, I give up on figuring out the reason when I know how to fix it.