> If you have much experience with cows and chickens, I think the perceived difference in capacity for suffering is pretty clear.

(word in bold added by me)

This is the crux of the whole debate imo. We simply don't know. For all you know, the chicken's experience is far worse, even if the external manifestation of their sufferring is less relatable.

And to take it a step further, potentially the same goes for plants.