Unfortunately, we got an answer (a disappointing one though):
“The “spiking” of midi-signals" is not a problem but a feature by design. You should not turn off the CMC’s midi output. You can however hiode the MIDI activity meter in the transportbar.”
It seems they are not even considering our request: please Steinberg, don’t remove the “feature by design” if you like it, just make its display switchable (on/off) for us who find it extremely irritating!!! Please!!!