Personally, I want nodes to have a common title because I track discussions and the level of replies through their title. I could be using Recently Active Threads to find nodes pertaining to a thread, but I'm not using it. Also I think that even RAT does not indicate at which level a reply sits. Which is why I ask authors not to erase the original thread title but to keep their additions or the relevant topic in parentheses. As an example, many nodes by tye have this.

I don't see that there is any technical need for preventing changing of the subject. The system does not need to be idiot-proof - completely erasing the title of a node rarely happens at all and there might be even a situation where I consider the complete eradication of the "level information" appropriate.

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