For bottom tree especially, there is a 600% boost PER FIRETEAM MEMBER. In PvP, that's a maximum of 3000% for Quickplay and 1800% for Competitive. You can literally play until a Ward of Dawn Titan has a bubble, throw down a rift with your entire fireteam inside and then step out and melt every opponent. Chain lightning chains to 5 people! Arc Web can hit people TWICE. It may not be incredibly broken. But the class abilities are so much more useful than they once were.