Oh yeah! I'm also into bi directional weight change.
Would also love to see an underweight weight stage - that skinny thing you encourage to eat just a little bit! Ofc each personality type responding differntly about beeing in the superlight stage.
This does not contradict the weight gain idea - becasue the actual weight gained gets more when you start low.
Further: Comparison between skinny<->fat is a kink many seem to be into.