It was made for DPS. They made massive numbers nerfs to them for healers and tanks after the fact.
They said something along the lines of “we don’t want people to have to change specs to get their cloaks upgraded” and made the changes.
They are fine for healers and tanks now but I wouldn’t say that they weren’t made with DPS specs in mind initially. Pretty big oversight, that they at least rectified.
The changes are documented in the hotfix thread for sometime during January: Hotfixes - Updated October 5