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In regards to the AT, what I have learned is to manage it's temp and replace the fluid as soon as you have overheated the oil.
This requires ideally a good ZF diagnostics head to readout the TCU metrics and also a cooling solution.
The stock cooling is not adequate and might lead to severe and premature wear. The rebuild of the gearbox on my former 3 series costed me around 2.5/3k. I then learned from that mechanic that much more and relevant metrics can be pulled from the TCU itself.
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BMW M550i G30 2019 - BM3
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