I'm not totally sure if those graphs are really representative of that, or at least they should be taken with a grain of salt. I've been using Nix for quite a while and I add packages I'm missing semi-regularly (although many of them are minor). The metapackage database on repology.org seems to indicate that it tracks every individual Haskell, PyPI package etc that we ship, so it's actually including thousands and thousands of auto-generated packages, and duplicate versions of everything in the top-level.
I'm not sure if that qualifies for "most packaged software" (since it skews the numbers very sharply in particular directions), but I guess you'd have to define it first. But Nix is different enough that it might be hard to have any kind of straight comparison.
I'm not sure if that qualifies for "most packaged software" (since it skews the numbers very sharply in particular directions), but I guess you'd have to define it first. But Nix is different enough that it might be hard to have any kind of straight comparison.