[immibis]

If the entire email is being replied to, I can just read that email, which is displayed immediately before the current one in a threaded display. Why should I have to scroll past another copy of that email?

However, the original email is included as a convenience in case my MUA doesn't support threaded display or it's a mailing list I joined after the original email was sent or any other reason why I might not see it. That's why there is quoting at all.

Nobody top-posts when using selective quoting because obviously it's different.