Hacking isn't the only thing you can do in the zombie skin. You can also bow spam, item glitch, and block glitch.
There are too many hackers as zombies, and it is almost impossible to know who they are. I could've banned several players for hacking, but I didn't because I couldn't see their name tags. Although it looks a bit better with zombie skins, there aren't any other pros for keeping it.
Support. The hackers need to be stop and the zombie skins really are more trouble than they are worth.
I actually think this should happen, but keep the skins. Just add tags to the zombies. Imo, the skin looks nicer and it's easier to tell the difference between human and zomb with it.