Yes I mentioned this as well. You gain an extra attack in a cooldown window roughly every 14-15% haste. Unclear whether that impact is worth the amount of TP efficiency lost from well, doing more abilities outside of that.

If you play what we'll assume is "smartly" and pool TP for cooldown phases, then its still a wash, and imo delaying your CDs to line up with fey light is probably not worth it unless it is less than a few seconds.