As they currently stand "Original message was taken by" segments may reference the beginning of a thread
or a message in the middle of one as well as appearing before the "posted by [blank] at [date]" which only adds more uncertainty in when any individual message was actually sent.
In addition, these "Original Message was taken by [blank] on [date]" segments could cause confusion if they have to be submitted to a court.
Thus this issue is not simply one of convenience or clarity for individuals in a firm but of legal security should these documents need to be presented in a court room.