There are very few reasons for needing that level of anonymity -- and none of them are good or honourable. Two purposes come to mind: sock-puppetry & trolling.

There are no legitimate reasons in having two or more comments in the same thread, by the same anonymous source, disassociated from each other.

For all other purposes, the ability to hold a conversation, anonymously, but with the continuity of the exchange unendangered by crosstalk with other AMs -- accidental or malicious -- can only be a good thing for all parties to the conversation.

There are very few reasons for needing that level of anonymity -- and none of them are good or honourable.

You do realize I hope that this is a most dangerous reasoning?

It is in the same category as the Government saying, "You do not need that strong level of encryption as none of your reasons for hiding your messages are good or honourable" (as per our Government sanctioned definition of "good" and "honourable").

If you want to avoid the crosstalk, use your PM-identity.

Honestly, why would someone use the AM option at all? It can only be for bad or dishonourable purposes, such as trolling or not taking responsability for what one says. (and I am being sarcastic here)

CountZero

A program should be light and agile, its subroutines connected like a string of pearls. The spirit and intent of the program should be retained throughout. There should be neither too little or too much, neither needless loops nor useless variables, neither lack of structure nor overwhelming rigidity." - The Tao of Programming, 4.1 - Geoffrey James