Originally Posted by
repechage
Take a bike, run 21-23 mm tires one it and then run 27-29 mm tires on it. Take some descents. It will not feel like the same bike.
I take your point (but I think I will not do the experiment

). However that tire switch makes many things different, such as tire deformation itself, the total wheel&tire weight, the amount of cushioning from the tires, etc. I wonder how much of the change in feel is due to each.
Oh well, it's fun to speculate.