It will be doing exactly as much damage against every single target except it deals more damage when you hit something without diseases. you can by all reasonable purposes consider ScS as being a physical attack since patch 3.3, the attack having a shadow part is just useless fluff.
These aren't buffs at all.. for pvp anyway
Dropping either disease, Ghoul, DC, Icy touch for this new glyph off an ability we all ready had.
Solves nothing, can't subspec into blood due to lichborne and the New SS just well wtf is it? won't it be doing less damage on plate? (forgive me if its not my maths is garbage)
In short, idiots who use scourge strike against targets without diseases on them got buffed. Nothing to see here, move along, doesn't solve shit.