All those projects existed long before package managers in programming languages were a thing (although you could consider the distro's package manager to fulfi

All those projects existed long before package managers in programming languages were a thing (although you could consider the distro's package manager to fulfill that purpose, I guess), so I don't think your point really takes away from mine. And for sure, there are critical dependencies like openssl that better be a shared endeavour. But whether you pull those dependencies in manually or through a package manager is somewhat tangential.