I use Apple products at work, and am otherwise not very invested in the world of Apple. I frequently will have to look up how to accomplish a task or get a particular piece of software working, and the author will assume that I'm familiar with where macOS <some place name> fits in the chronology vs. macOS <some other place name>, requiring me to look it up.

Worse for me than the Android dessert names were, since at least those were ordered.