When bouncing an event, it re-colours the event back to the colour of the track.
I think I would prefer for the most part, at least sometimes, for the event to stay the colour I had assigned to it before the bounce. I use colours as editing notes/reminders of what is what.
in the situation where there are multiple events with different colours being bounced, if this preference were on, it would use the colour of the biggest event.
I could always manually assign the track colour to events when I’m ready to do so (there should be a hotkey for this!)