Yes but “real cheese” is made with real cheese so if you say “don’t buy anything made with real cheese” then no cheese at all for you.

Same with genuine leather, if you say “don’t buy genuine leather” then you’ve excluded all real leather full grain or otherwise.

The problem is that full grain>top grain>genuine breakdown just is a shortcut that kinda works when reading brief descriptions but not a true “grading scale” as the internet portrays it.