Does it look damaged? Separated?, undue vibration? I'm not sure if people just change them out as prevention, I assume most would do so when replacing the oil seal since the balancer would need to be removed anyhow. Although mine is an OM603, the balancer is still original and in good visual shape, and oil leakage from the front nain seal is not bad enough to warrant replacing it yet at 300k miles.

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Stable Mates:
1987 300TD 310K mi (Hans)
2008 Jeep Grand Cherokee OM642 165k mi (Benzrokee)