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Originally Posted by JCL
My largest concern is with moving sediment around upon repressurizing clutch packs, solenoids, etc. It is a classic failure mode for transmissions that otherwise work fine, have no apparent problems, get a fluid change and then fail soon after. If you don't think it is a risk, then you should change the fluid. We aren't talking absolutes here, whereby every fluid change causes a subsequent failure, just a risk profile, whereby there are many failures that can be attributed to fluid changes.
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This is just a restatement of the post FSETH linked to. There you said you felt the chances of dislodging sediment are slight. I agree with this. There is a possibility but I don't see it being very high. Nor do I see any evidence the dislodged sediment, in the slight case it occurs, results in transmission failure.
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The other risk is that the fluid has changed viscosity over time, and when you put new (thinner) fluid in, it doesn't work as well due to being thinner. The transmission adapts to different fluid characteristics over time.
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I am assuming you're replacing the fluid with the recommended fluid. Which makes this point moot.