I like the zombie trope but you really can’t get only the good parts and leave out the bad ones.
If zombies are rotting corpses, every carrion eating insect is going to have a field day. Plus any other predator or even any animal feeling threaned.
Plus the weather. Heat accelerates decomposition. Cold burns tissues. Water logfing from rain would be a nuisance, at least. Too dry, you get mummies.
That’s a sub trope that makes me wonder: why animate a corpse when animating the skeleton alone achieves the same purposes? For visual impact?
And even in magic universes, physics still afects everything. Frost freezes the undead, heat cinzes their flesh, etc.