I'm pretty sure that the reason is:

{
   # do loop stuff to be done at least once
   last if BREAK-CONDITION;
   # do middle loop stuff  <<< This part was left out
   redo;
}
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which I'd still use while(1) for. Plus it allows you to do:

{
    # read next line
    last if NoMoreLines
    # extract item from line
    redo if NoItemInLine
    last if EndOfItemListFound
    # categorize item
    redo if WrongItemCategory
    # check for updates
    redo if NoUpdatesThisCategory;
    # check permissions
    last if NoUpdatesAllowed;
    redo if ThisUpdateNotAllowed;
    # do update
    redo if NotFatal;
    # handle fatal error
    # (note, no "redo" here so this part isn't really
    #  part of the "loop", just stuff to do once unless
    #  "last" gets triggered above.)
}
# done with items
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where it is very easy to throw in a new check or new code in. But, as I said elsewhere, I find that power to be too easy to abuse. YMMV.

        - tye (but my friends call me "Tye")