I forgot to add something. 2 or so years ago when I did ED on my F10 M5 I had the chance to visit M GmbH. I asked this very question.
The response was a bit odd but not entirely unexpected.
First, they said that the ceramic controls were a bit slippery and wouldn't make the ideal material for the gear selector, especially if you're on the track and not wearing gloves.
Second, the designers want harmony in the cabin and wouldn't put in a shifter that didn't match the other control surfaces.
I suggested alcantara to them, and they sort of smiled. That was that.
So I guess we will never know the real reason, but it would be beautiful to have as an option.
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