[Perfectlap]

Why would anyone do a $16K rebuild and not remove the IMS altogether?
Was a direct oil feed introduced to mitigate the possibility of IMSB failure?
Has it not been established that the inherent flaw in the use of sealed bearing, inside of an engine, is that either oil starvation or contamination can exacerbate an ageing bearing or a defective one?

It seems to me that the very point of a rebuild (that exceeds the replacement cost of the vehicle) is that the most documented modes of failure are addressed as affirmatively as possible.

Why would someone leave a variable in the equation that could sink the whole expense?

Obviously there many ways that these engines can fail and one can spend much more than $16K, but this particular mode of failure is basically defying you to ignore it once you have the whole engine is apart.