The meme is mostly a relic from the days when installing Arch was a very involved and mostly manual process – it wasn’t to the level of LFS, but you had to configure most of the base system, and it would leave you with a pretty bare-bones setup (no GUI by default, etc). So it was a pretty big hurdle and successfully installing it did give you a bit of nerd cred, though even then the “arch BTW” meme was tongue in cheek.
These days it’s just one of the most well-supported rolling release distros, and it’s got automated installers and GUI spins just like any popular distro. The two biggest assets are the AUR and the wiki.
NixOS does kind of feel like the spiritual successor in terms of effort to set up, and in that immutable OSes are kind of the next big thing, like rolling release was fairly unconventional when Arch was taking off.
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