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> Yes. Personally, I believe that these are features rather than issues. I don't ever want my system to be in a partially upgraded state. I treat inability to fully upgrade as a maintenance problem that I have to solve.

You don't ever have to install without upgrading on any other package manager or distro, either, though. And the way Pacman refuses to run `pacman -Syu` if some packages can't be upgraded doesn't doesn't really save you from partial upgrades, because nothing actually stops you from running `pacman -Sy <package name>`, and that is a thing people do.

> Yes, those are fair points. I suppose I don't feel this pain because I don't actually use the AUR very often. When ABIs are broken, Arch maintainers will recompile and update all affected packages. Naturally, AUR packages will not be included...

For some years (longer than I ever continuously ran Arch) I used to run Sabayon Linux. It had its own package manager, Entropy, which was hugely impressive to me at the time. It supported all of Portage's masking facilities for managing and constraining version, but it was centered on binary packages, and it was really, really fast.

At the same time, it was sort of compatible with Portage, so you could install software with `emerge` and then reconcile the Entropy package database with the newly-installed outside packages, I think with `equo spmsync`, or something like that. Of course, working this way was totally unsupported, but it was also perfectly reliable, if you knew what you were doing. Just make sure to run `revdep-rebuild && equo spmsync` after every `equo upgrade`, or whatever.

In a way, it was very similar to Arch, except instead of the AUR, you had all of Gentoo, and, if you wanted, the overlay system (its third-party repos). The integration was a little tighter, and Portage was/is a full-fledged package manager that sees use as a core tool for other distros, not one of a dozen competing wrappers around an unofficial source control repo and Entropy, so that side of things was much more powerful as well.

It was pretty cool. But the whole bifurcation between the worlds of binary packages and the source-based package management system was a persistent annoyance. There was always some hope and desire that in the future, they could be better integrated.

Arch seems content to have this kind of eternal twilight, with a package manager that's sort of source-based and sort of binary, and to get a whole package manager out of the source-based side you need some third-party wrapper tools. Then the AUR is this de facto source-based community repo with extraordinarily low packaging standards, and it never gets binary caching. It just feels half finished, and the roadmap for Arch seems to be to leave it that way forever. (I'm sure many packages graduate into the community repos all the time, which is great.)

But there are full-fledged source-based package managers now (Nix, Guix, Homebrew) where binary caching is totally transparent. There's no two kinds of repos, one source-based and one binary, and if you modify a package that's part of the main repos, the package manager just chugs along and builds it from source like nothing happened. And when it's done, it's a first-class citizen of your system no matter where it came from.

You can basically learn not to use things from the AUR because they're second-class, especially if you maintain your own local repository or you contribute to the Arch repos. It seems lots of people do. But the way many, many people use the distro is still fundamentally split between two worlds, just like the way I used Sabayon more than 10 years ago.