I disagree. Users should have some way of signaling that they no longer support a particular note for whatever reason. It's unfair to have no way of removing a note or adding updated context to it.
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Some clients already provide this option, such as @Amethyst editing feature.
Replying to a previous posted note with clarification is a way of adding context. I enjoy screen captures of posts that big shots put out on x and later deleted. Shows the character of the people influencing others. Your notes can be saved by anyone with or without the memory hole button.
'no delete' as a feature not a bug.