In Minecraft, currently the only 2 bosses in the game are the Ender Dragon and the Wither. I believe the Wither is supposed to be more challenging for the player, but here it doesn't seem that way. You don't need any over powered gear, and it's incredibly simple. This is because, (I'm not sure if it was intentional or not) that the Wither can't wither you, so all it can do it hurt you with the projectiles it spits at you. So, if you're any good at dodging projectiles, it's even easier to fight. I have a feeling that the wither effect wasn't supposed to be removed from the server, as Wither Skeletons can wither you, so I don't see why the Wither shouldn't.

Basically, I just suggest that this is changed. Make it so that Withers can wither you. Increase the difficulty of the battle.