I don't think the water getting in the cargo area when you open the hatch is BMWs problem. That happens on other makes as well, and I have had it happen to me with other vehicles. It doesn't sound like it leaks when the hatch is closed.
As to the wind noise, I see you are posting on the separate thread for noise, so will leave that issue alone on this thread.
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2018 340i xDrive M Perf Edtn Sunset Orange
Previous BMWs - 19 others since 1971.
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