> What matters is the relevance of the packages in the main repositories, not the quantity.
This is a good point. It would be awesome if we had the metrics to look at this. I would not be surprised if Arch had a good focus on popular packages.
And yeah, what's relevant will vary between users.
> As for the fudge factor, it would be difficult to even agree upon criteria. For example: should python or rust libraries be included, given they have their own package managers?
I don't think this particular case would be too tricky. We can probably exclude them, or just count them separately. Libraries packaged in the distro package manager are useful, but they're mostly useful for simplifying the process of creating new packages for the distro.