Ever since mend wounds and his moprhs were introduced to no one ever used it except some niche builds. Both in pvp and pve it was more of a RP choice, then an actual good alternative to attacking your enemy on healers. Both shock staff and restro staff are better to use then mend wounds. And instead of making this skill actually usefull, you started to mini nerf it into the ground by not making it proc skills and sets anymore that were able to be proced of it. And now also this:
"Fixed an issue where you could still get Magicka from heavy attacking a target with this ability without actually healing them."
In eso high dynamic gameplay you will hit a full health target alot, but you still need to sustain your buff and heal skills. While restro staff and destro staff always gives you reliable sustain mend wounds doesent, they also not applying buffs to you/ debuffs on the enemy.
There are so many interesting things you could do to make this skill a viable alternative for pure healing builds, yet instead its remaining mostly useless.