.... you have to worry about, if you want to heal in town, leaving behind poison that will injure others and cause hostilities. Yadda yadda.
There is poisoned food in the game. You can also craft it.
In combat advantages of Zombie talent outweigh the out of combat disadvantages you mentioned.
For me if Zombie does become a racial for the undead (something I am fine with,by the way) then we should get a source skill that adds the talent to a non-undead character,because,if I am not mistaken, undeath is a magical disease which can be spread in the universe of this game as well.