I totally agree that you can’t just do a 1:1 comparison. My point is not to say that a shrimp suffers .05% as much as a chicken, but to use a chicken as a point of reference to illustrate just how simple the nervous system of a shrimp is.
We’re talking about a scale here where we have to question whether the notion of suffering is applicable at all before we try to put it on any kind of spectrum.