It just gets out classed by the other 2. so it needs a buff. Sure it doesnt need to be 30 seconds but 3min early game is pretty rough. you get to gank with it like 2-3 times before lane phase is over in most games. You get your clear done and gank around 3min. 1 use. Then you wait 3 min for it to recharge, but that's no guarantee you use it immediately so lets say you get to use it again at 9min. then its another 4min till there is an opportunity to use it again. so its 13min in. At this point by the time its back up again lane phase is over.
Electrocute on the other hand? its up literally every time you gank. Dark harvest doesnt have a cooldown. its just "did you kill something with a harvest stack prior to the gank? if so you are ready to go.
There is too much downtime on predator. Ghost is 3min cooldown ffs. Why is Predator having the same cooldown as a summoner spell.
Predator needs a 120 second cooldown base and then after you level to reduction point it becomes 90 seconds.
Its just dumb to have your main keystone to be down so often when it has to be used preemptively to be able to use it.
Every other keystone has some guarantee that you will actually use it. Predator? you might pop it to gank and the person immediately flashes away and gets away from you gank. welp 3min cooldown. Also with predator the keystone is locked behind 300 gold. every other keystone starts working immediately. Not predator.
Saying that the keystone doesnt need to be buffed is dumb because its actually the worst of that tree. It doesnt scale like Dark Harvest, and it doesnt have the consistency of electrocute. It needs a buff