Isn't conveniencing the end user kind of the goal of all software? Surely there is value in tracking dependencies and conflicts (and in avoiding problems that can arise without these things) that should not reasonably be dismissed as "nothing but convenience". Perhaps I could say the same of every useful thing you've worked on.

I'm not debating that nor am I dismissing that package repositories provide tremendous value to the user. However, the parent asserts that package repositories act as a gatekeeper, thus making it harder for users to install software that is not in the package repositories. That's not true, since linux/BSD/MacOS package repositories just enhance an open system. In that context, they're mere convenience, not a requirement.

External dependency hell. Not in the repository, not invited.