However, it seems to me that at least some parts of longtermist EA , some of the time, to some extent, disregard the animal suffering opportunity cost almost entirely.
I’m not sure how you come to this conclusion, or even what it would mean to “disregard the opportunity cost”.
Longtermist EAs generally know their money could go towards reducing animal suffering and do good. They know and generally acknowledge that there is an opportunity cost of giving to longtermist causes. They simply think their money could do the most good if given to longtermist causes.
I’m not sure how you come to this conclusion, or even what it would mean to “disregard the opportunity cost”.
Longtermist EAs generally know their money could go towards reducing animal suffering and do good. They know and generally acknowledge that there is an opportunity cost of giving to longtermist causes. They simply think their money could do the most good if given to longtermist causes.