Probably because there was a lot of verbal noise about how unfair it was about a were getting a single lucky bite/strike and then the PC is laden with a condition that can be a right pain the arse to deal and/or get rid of.
For a lot of players, the fun isn't in struggling to maintain your humanity as you slowly succumb to your condition, but rather meeting interesting creatures, slaughtering the lot, and taking their loot.
Personally, I'm glad the virulence of those attacks have been watered down.
Of course, nobody is stopping you from upping the potency of those attacks for your own games if you so desire.