the VW 09M transmission, which is a Aisin 6-speed transmission just beats up the VW Toyota Type-IV fluid. It's not a quick shifting transmission either. VW historically has issues with the Aisin transmission, starting with their "initial recommendation" of the claim of the Lifetime fluid, until they got excessive transmission failures below 100,000 miles. This caused VW to issue an Maintenance book update to recommend 50,000 mile intervals.
There is no external line for the transmission cooler, as it is built into the transmission for my car. Certain 09G's had an external transmission cooler, which you can do a flush if you wanted.
since it's just drain & refill, that leaves a good chunk of residual ATF in the torque converter that mixes with the new ATF.
There is also a scenario with the transmission that provides a harsh shift that I used to be able to replicate on a certain road back in Northern Jersey in the boonies, with 3/4 throttle.
I remember reading Platinum is supposed to be heavier duty than Red, but adds their so-called Synergol TMS additive.
The Aisin transmission is also notorious for valve body failures with the VW fluid as well, especially on the 09G version (less max torque).
Not to mention, my ECU is also reprogrammed to provide more HP & TQ (which the torque is near the upper limit of the 09M).