I can't speak to the m235i, but go to grassroots racing and it's full of ancient M3s with ancient transmissions that work great.
My E46 was double tracked and was still on its stock clutch at 180k miles
Look around and you'll see IMG's video of a stage 3 supercharged E9X with 780whp and the stock 6MT/clutch, zero issues at 100k miles
They are practically indestructible. If someone went through one at 10k miles it's either operator error or a defect in the part
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