Well, glad that’s cleared up.
As far as Spitters, I think they don’t explode because Bloaters and Boomers already fill the “exploding zombie” role and because the acid they spew isn’t that large in volume, but it spreads out over a wide area when it hits the ground, making it little more than just a thin covering. Thin covering or not, though, it’s still very potent acid. (Also, they’re annoying enough already without exploding.)
Exploding Spitters has little to do with the original suggestion, though, which is why I reacted negatively to your mention of it; it seemed to me like you were polluting the thread with a completely random idea.
Also, thanks for the explanation of the, er… tree analogy. I understand what you mean now. You’re saying “Just because a lot of things are unrealistic, doesn’t mean everything has to follow that trend.”
Still, it’s not fair to call unrealistic aspects of the game bad and equate them to a forest fire. Like Hardluck said, hard realism is not always the recipe for success. Unrealistic things are often loads of fun, even in survival games. Just look at Don’t Starve. It’s completely insane, realistic elements mixing with completely nonsensical aspects to make something that a lot of people enjoy.
Would it be realistic to make Cataclysm characters have to urinate a few times every day? Yes. Would it be fun? NO! It would be an annoyance, accomplishing nothing apart from forcing you to press a button a couple of times every in-game day.
Bottom Line:
Realism =/= Fun.
Sometimes it does. But not always.