Hypnotize, the ignored skill?

Apparently, nobody bothers using it, and even the skill builds put it in pretty late, with only one point at first.

It would seem pretty useful at a boss if you can get one part of Horntail or Zakum to attack another part. Also, in training, if you hypnotize one monster and move to another part of the map, you may end up clearing a lot more monsters?

does it work on boss? o.o