I suppose you could do that, however, the file used to replay back things would save all structures, where their x y z is, and etc. I don’t see an easy solution for the client to “pick and choose” what structures should or shouldn’t be saved. Ultimately this line of thought would mean players will find a way to cheat the replay system in order to spot structures not limited to 1st/3rd person or “unlock” replays without directly hacking or use of a hacked client in-game.
It’s a whole lot better than say, having absolutely no way to defend against hackers. I’d appreciate methods or tools to catch hackers - and franchises that are dedicated to cleansing hackers will be reputable and known for such a thing.
Which is great - reputable, good servers with active staff to catch hackers get their respected and rightful reputation while players that appreciate no cheaters will play on them. Likewise, dead servers will no staff may and more-than-likely will have more cheaters. Why cheat on a server with active staff and mods when you could go join one that has none?