It's not really about how big or small the team is, it's that it's a cross discipline task. And most players also don't realize how complex game Dev can get behind the scenes.
Design needs to figure out how we are doing the representation (eg. We tried several different things before landing on the healthbar).
Once we decide this is the solution we're going for, Engineering then need to extend the UI system to include this zombie state in the UI system without breaking anything.
Visual design then needs to create several icons, before we settle on the correct one. And hooking them up in game to be playtested is not trivial either, you can't just throw a png in a folder and have a designer hook it up and call it a day. Textures also need to undergo optimization so they don't consume too much memory.
A producer will also need to weigh this work against the other priorities. Eg. Did the engineer have to tackle some emergent bugs that are negatively ...
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