Re: enriched-mode and switching major modes.

[Richard Stallman]

    I think that where we have structural information particular to the
    buffer (like "this is a section heading"), it could be preferable if
    this information got lost on copy&paste.

This must be a misunderstanding of the issue.  Consider C-x h C-w C-x
u.  Should it forget the structure of your document?  Clearly not.