We believe there was a lot of confusion when we originally announced this change and we're certainly at fault for said confusion. The original patch note was very vague to the point of being misleading. It was never our intent to weaken old raid boss encounters to allow anyone to have a chance to solo them, regardless of class, spec, or skill.
What we did change were encounters that were mechanically impossible for one person to accomplish, solely for the purpose of ensuring players have easier access to the hunt for the new rare companion pets -- the drop rates of which are actually set to account for a group of three players, not one.
Moving forward, though, we do not plan to adjust encounters for tougher raid bosses to be solo’able by all classes and specs.
Thank you for clarifying this.