It improved the damage of the radial assault, but these changes IMPROVE the strength of core assault AND make the increased damage from core assault stack with team damage buffs more easily.
Second, I've been min maxing the shit out of a bunch of tanker builds with these changes, and there is finally a reason to actually make tankers. The changes are a net positive for solo damage for all of the high end builds I've made - this is a net increase against strong AVs etc. in a solo situation because bruising was resisted by the purple patch (9.6% debuff after you have an alpha slot level shift).
Will they do slightly less damage with a full team against an AV? Yes. But they will do significantly more damage in every other situation, and are also going to be better at buffing teammates via leadership, which they will also be better at running due to the end changes. Taking assault pretty much gives you half of your bruising debuff back anyway - only characters stacking tons of damage already through IOs or Kin would have significantly better performance from utilizing a tank's bruising than from the leadership buff.
I'm sorry you don't like the changes and are losing bruising, I can see how some people might have been attached to that inherent. If you look at it objectively it's not really even a significant single target nerf, and the damage scalar changes have definitely made tanks more attractive to me. I haven't made a tanker since the game relaunched, and I'm going to be making one for the first time since I20.