Storm Grip cannot one shot and neither can the Scorch melee unless in Radiance. But they do alot of damage. Throwing knoves deal lile 146 damage on headshot wirhout the burn, that leaves less than half health for the player getting hit. All the melee abilities deal similar damages. They dont want players to turn a corner, get shot once by a handcannon and get killed by a throwing knife bevause you cant really react to that. Granted, to be able to do this to someone takes skill, but perhaps this wasnt the way they envisioned throwing knives to be used. Same logic probably applies to the tripmine changes.