It appears you have been reading my posts here and on other game’s forums. I’ve been advocating for just such things since PvE survival games became a thing. Only 7D2D is free from these problems, if on the big map. Map is so big, you just don’t have an issue with it. Plus, the zombies do make you need to repair, a lot.
My favorite way to do this actually involves all three. But I should note that for #3 to work, you would need an area affect on repair hammers, that is significant, or you would restrict how people build. You would have to make sure every last structure piece is exposed, or it would decay with no chance to repair. Area affect on the repair hammer takes care of that.
What I would like to see is an expansion on the idea of PvE-C. If done right, this would be the most popular game mode, and allow for casual and hardcore players to enjoy the game. To do that, many of these concepts would need to be implemented. In short, you use the land claim system to allow for what everyone wants from PvE-C…a base that is safe from attack. Outside of that claim, structures can be destroyed. I will make a suggestion thread to discuss it.