Blue wither skulls nerfed or removed

Blue wither skulls are there to prevent a player from hiding from the wither, or to prevent it from being trapped. However, they do neither. When a player hides, it still doesn't tend to find anything but the player's builds, pets, and animals. All it does is randomly grief things to no avail, and has destroyed many servers. It stays trapped anyway, as it can't break bedrock. The only real reason to trap a wither now is for a wither rose farm, and there are many methods of preventing blue skulls. The issue is, the blue skulls do nothing but destroy things, and the player should at the very least be able to decide what builds to protect. If you don't remove blue skulls, at least make them less op and not break obsidian. Mojang, I know you don't like automation, and this also helps prevent obsidian farms and encourage people to barter for renewable obsidian! Wither rose farms are going to happen anyway, and this will just save people's servers and not encourage wither rose farms. All in all, it is a win-win-win for everyone, except the wither.