Trips aren't useless now, but the issue I see is there's no compelling reason to run them over anything else. Generally speaking, the incendiary is far and away better, especially since a direct hit is a OHK, and the burn on a lesser hit improves the functionality. Swarm is almost completely pointless; not only have I seen people simply run through them, I have done the same, done a triple-jump, and escaped relatively unharmed many times. There's no reason to use it, and I'd have to write a paper to describe how to fix it. Knifes are another story. I actually have no issue with them in PvP right now, as they are sill a one-tap / face knife kill with a hand cannon. the damage is fine in that respect. PvE is where I have an issue, as I can't count the number of times they have failed to kill a T1 mob for me, and that's pretty sad. I really wish, if the incendiary knife was the issue, that they had reduced the base damage on that perk and kept the burn the same; the DoT adds utility, after all. Overall, I see Bungie trying to reduce the output of a class that was probably being played for it's mobility and super, rather than it's grenade and knives and really failing to hit the mark. At the end of the day, I'm fine with it, but they did something they didn't need to do, and that didn't even have the effect they wanted.