I surely hope that harm touches weren't changed just because of one fight. Change the mob so it's immune to harm touches instead of changing the whole iconic ability of a class. It is a pretty significant nerf to go from three ways to do some pretty significant damage and get snap agro to just one way. Like the others have said, normal harm touch and leech touch pretty much have been sidelined if this was intentional. It also feels like the one good tome SKs have that increases all three harm touches was cheapened.
If this is intentional, then at least a MOTD instead of a stealth nerf. I'm usually a pretty easy going guy but finding out about stuff like this during a "oh crap" moment just aggravates you.