low fluid I can understand being a problem. But high fluid.. I've heard is bad..

foaming/cavitation/ATF breakdown.. which of course leads to more serious problems.

But I've never really seen a good explaination as to why that would happen.

To be honest I'm just a step past the "Automatic Transmission as a Magic Box" phase.

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'84 300CD Turbo 132k (Anthracite Grey) - WVO - My daily driver - Recently named coo-coo-coupe by my daughter.
'84 300D Turbo 240k (Anthracite Grey) - Garage Queen
'83 300D Turbo 220k (Orient Red) - WVO - Wifes daily driver

I'm not a certified mechanic, but I did stay at a HolidayInn Express last night.