ZD,
“If you let the slaughtered chickens last too long in the sun, then they are spoiled. A regular slaugher house processes the chickens fairly quckly while kaparot on the street does not.”
I have not seen this in the places I’ve been to and the ones that shecht also have a group flecking and koshering the chickens as well.
This is besides have the chickens out of the transport boxes and kept in a gated off area with saw dust, feed and water.
And, have you ever been to a shlachthoiz? Sounds like you have not.