Often I'll have multiple T4s in a chunk but I want to change something in a system but I lost all the blocks I mine and it locks the tier 4s. People also often throw junk into T4s to lock them. I know you can stop people from throwing things at all on your island but this stops people being able to donate for example. I have lots of spawners in a chunk so I spend ages adding all of the items I don't want in a hopper into it so I can have seperate hoppers for specific items. We usually only ever want 1 item to flow into a hopper anyways so what's the point in a blacklist?