The talent is in Tier 6 of Corruption (Penetrating Darkness) and adds 3% accuracy to a class that does not use it. A sorcerer, especially being a healer, has no use for accuracy. This has to be a mistake that has been overlooked time and time again.
Instead move it over to the assassin class which could actually see some use of it. Perhaps replace 3% accuracy with 3% surge for the healers instead, or just more bonus healing from the talent.
BW doesn't realize healing sorcs don't use accuracy- or they're trolling us. I dare you to find such a useless thing in any other class that far into the tree.