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Cause there’s like six other distros based on it. The point is that a package manager especially is a huge part of what differentiates the general experience of using a distro, and how a derivative distro works. And sure, lots of other details. Something like Manjaro, Artix etc. is basically cut from Arch as a template, often incorporating upstream changes or packages, with downstream changes based on differences of opinion.
I don’t think this is a well-defined term, so not much point in arguing about its definition.