Trying to make it a bit clearer …
Realtime record some gentle hits on one track
Ensure the sound has pitch as a destination for vel (for audition clarity)
Now try to overdub that take on the same track (not chromatic mode), but this time play demonstrably harder, so you can hear that the overdubbing is not successful !
Result= no overdubbing with same note ie Huge performance PITA, no ?
Riot !