I don’t think the current changes to Rage Burst do anything to address the real problem with it, which is that it is much more effective with high damage single-shot weapons than burst fire weapons, even more so now with the accuracy penalty.
My thinking is that it should revert to its original mode of operation, i.e. fires off a full magazine, but that it should be removed from the Heavy tree, renamed Full Auto, restricted to AR Rifles and put into the assault tree as a replacement for Rally the Troops. This would make AR Rifles, and the Assault class much more effective than they are currently whilst removing the OP Sniper Rifle/Hel Cannon Rage Burst meta.
It should be replaced in the Heavy tree with a Machine Gun specific suppression ability. In RL combat the role of the machine gun is a support role, they are typically too inaccurate for direct fire and are used for area denial and suppressing enemy fire and movement. A suppression skill that reduced enemy accuracy and movement speed in a conal area in front of the MG but which did little direct damage would be an accurate in game representation of this.