I am not talking in terms of "Should the undead have the Zombie trait" but whether it should be unique to them and stay removed. Which I agree, keep it removed.
As for "The Zombie Trait is annoying as fudge" I agree! They should endevour to ensure that while the undead are more of a challenge that playing them isn't a drag.
Oh, okay, I misunderstood. As long as Zombie doesn't become the Undead Racial skill, I don't especially care what happens to it, although some people do like to make 4-zombie parties, which would be difficult to do in single-player if it was restricted to Undead-only.
Zombie absolutely should not be the undead racial, but would be okay if it was an optional talent that only the undead could choose.
AOE skills should check if a character is a zombie, so a healing ricochet automatically avoids them, and maybe something like contaminate would actually effect your zombie allies. And vampiric skills like blood bubble and mosquito swarm should still work. And if poison also helped regenerate your armor (at least a little bit), that would make it way better too. Between all those, zombie would be a lot more functional, while still requiring some dedication to make it work (which is okay I think, given it's a big change.)
If you are a Zombie, does magic armor still block Poisoned status? If so, the Zombie trait could change it so that poison bypasses magic armor. This prevents it from damaging magic armor and allows surfaces to more easily apply poisoned status.