Interesting, if opening of the butterfly is behind dc motor and computer, things are quite nasty to solve. If opening speed of the butterfly is controlled, then wheel spinnig can be easily avoided, just open butterly slighly slower to wide open, so wheels don't spin. Still you have the all the power available for top speed. Can this be a software feature with some 500E ?
Or if there is a wear or dirt at EA, it can open slowly or not fully open, but still working good enough that ECU doesn't show error codes?
When ASR cuts power when detecting spinning, does it affect only to the butterfly(just reduce opening) or does it something else also(cut fuel delivery)?
I have also w124 turbo diesel,which seems to be only choise to drive if you want to do you own maintenance.No electronics, no worries.