As a fic writer, if the LJ-cut text appeared in a different color, I would personally not be overmuch bothered. It'd look, properly, like the code-implementation had changed slightly and while mildly repetitive... I could fix it as it came up if it really bugged me. It wouldn't look like I was being a complete idjit and repeating text.

On the other hand, I know some writers who've posted stuff where... I kinda miss not seeing the cut-tag's title-text, actually.

Now, the really clever hack would be to make the code somehow identify if the text immediately following the cut-tag was identical to the text within the cut-tag-title, and then not duplicate. But that would probably not be easy.

Hm. I wonder if that could be a Style option? "Show cut-tag text on [my/all] individual messages"?