One more thing…

It’s not completely harmless. We had this discussion ages ago, and the fact game up that you could make a schematic of someone’s base on this server, which would obviously give you a huge advantage, and the ability to explore all the nooks and crannies of their base. It’s invaluable as a tool, yes, but you can just as easily open up two minecraft clients, one in single player and one on the server, and switch between the two when you need a guide with a build.