Sometimes, people want complete privacy from the full world. This doesn't concern players, but this is for builders and advanced builders.
Some people don't want prying eyes in their plots, but noone uses /plotme deny. People don't use whispers, instead they talk about their build freely in main chat. If you have it out in the open, but don't want people coming to you, keep it a secret in the first place. No, no, I am not insisting I am part of the NSA, but I just want to see great builds that are mentioned in chat. This is a public server, and it's a free creative server.
It's a shame to keep raising permissions, but I'm just disappointed to be shoo'd away when I arrive already when I want to see other builds. After all, what good does it that you freely talk about secret projects in the open. That's the same as having a group call with enemies and sharing your plans.
TL;DR (lazy reader) - Raise /tp perms and have anyone below OP use the Bring/Call System.
Edit: Raxo. Mister. You better reply on why you disagree with me. You must state your evidence, this is a public server and I feel that Bring/Call system is necessary.
People say their builds are great. It's so great and mighty, noone but OPs can see it!
This is a build server, we help each other to be better. We don't reserve special rights.