Generally true, but... there can be exceptions. Pick this up in a Huddle?
The Colony
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I am asked, with a frequency I have come to find wearying, whether the events of my novels "really happened...
There is a peculiar sickness that has crept into historical fiction...
dropping seeds all over the place
I see it as simple: "Dear Agent, If you think you might want to hear from this person again, feel free to provide 'a lot of "helpful feedback" in a' rejection/pass. If not, don't."
However I also understand, possibly wrongly, that it is an unwritten rule for agents that once a rejection is decided upon (even if pleasant and near-miss type) and sent, no further correspondence about that submission should EVER be countenanced. Maybe @AgentPete could clarify.