I don't see how using delayed expunge would really be consider abuse, the documentation makes mention of its use for this very reason.
"In any case, the time between a message arriving and being deleted may not be sufficient to ensure the message is replicated, included in the next backup cycle, and generally available for recovery or compliance with the regulatory environment."
We use rsync to make a duplicate of the email spool to a file server at regular intervals, which eventually makes its way to tape. Although we don't have regulatory requirements I've had to do a few recoveries and have done so without problem.
in our case we have cyr_expire set to 3 days (I believe the default config), which provides more than enough time to in case a backup fails for some reason or another.
Of course these tools offer features but that all comes at a price.
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