I used to ride clipless pedals all my MTB life and have recently switched to flat pedals because I feel that having my feet free makes me experiment more with my riding technique and progress faster. I have ridden a very quick rebound all the time and felt comfortable with it when riding clipless but when I switched to flat pedals my feet were kicked out of the pedals. I've adjusted to a slower rebound and feel comfortable now.
But this makes me wonder what the correct rebound setting when riding clipless is. Should it be set as if my feet weren't attached to the pedal? Or is the idea that you can ride a quicker rebound since your feet will stick to the pedals anyway? (of course only as long as the rebound isn't so strong that it kicks your body to the bars)