I suspect that the BMW warranty analysis/marketing situation isn't granular enough to deal with the niche'ness of the CSL and it's almost also not worth them bothering to figure it all out.
It works both ways (we benefit as do BMW) and the sometimes crazy outlier situations don't leap out of the spreadsheets as being wrong enough to fix.
Or as cars get older and parts scarcer someone might notice, re-work the sums and then it all stops or it gets really expensive.
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