So, I realize at higher levels this doesn't apply, but I've been leveling lower classes of late, and remembered what a huge annoyance it is to have a FATE spawn on top of you. I've died 2-3 times now because I've been mid-Leve, pleasantly killing a mob or two at once, only to have a dozen Kedtraps spawn in a circle around me and obliterate me in a few seconds.
It would be nice to have a warning system, or a 30-second delay on mob aggression in FATEs upon their initial spawn. Just something so that you're not automatically thrown into the thick of it if you're not ready.