How do you prefer to read Job? With or without the prologue and epilogue?
As I'm sure you know the prologue and epilogue are in prose--unlike the body of Job itself--and are usually thought to have been added later. Both--but especially the epilogue--change the meaning of Job.
The prologue attempts to explain why Job experienced his trials. Instead of letting it be assumed that such things are unknown, unknowable, or are simply part of the mortal existance.
The epilogue also changes. It teaches that man should endure suffering so he will be rewarded by God. Without the epilogue the meaning of Job is that suffering is best endured by drawing close to God.
Both change the central meaning of Job, which is that man suffers in mortality--not because of personal sin--but rather because suffering is part of the mortality--by trying to provide reasons (a test) for suffering during mortality.