Not sure that’s why people dislike casual grade, at least from reading:
I think there being only two options (captive/casual -or- wild) reinforces black-and-white, yes-or-no, right-or-wrong thinking to some degree, which maybe drives discussions about these edge cases? The lack of consensus in discussion about these edge cases maybe highlights the need for a 3rd option (captive/casual, wild -or- unsure) which might put an end to these topics?