> using Beer terms is apparently cool for software packaging so lets port the idea of Homebrew back to Linux.

No, second-level package managers serve a very valuable role. They allow coeexistence of a stable base platform that packaged software (whether OS X apps or Linux packages) can target, while fully enabling the user to maintain a user-controlled and customizable set of tools. There's zero conceptual difference to what we've been doing forever with software built and installed into /usr/local, but sharing the burden of build and package maintenance. If you've ever run into the "argh, need package X (at version Y?) but $DISTRO doesn't have it!", then this is your out.

> There is nothing inherent about this concept that can't be achieved with a regular package - you're just placing compiled files in certain directories.

This is a statement made in a vacuum from the today-reality of Linux package managers. First everything important about the needs of 2nd-tier packaging works depends utterly on the stuff you cast aside: tooling and conventions and workflow above the mere fact of stuff-on-filesystem. In which case the devilish details of the package managers and the cultures they are embedded in are paramount. Yes, this is more about politics than technology. Distros don't want to maintain an entire suite of packages for language platforms. They pick some release they deem "stable", often with little actual sense of the needs of that language's community, and ship it. Individuals don't want to personally maintain an entire herd of packages, or have to maintain or depend on random PPAs. Also, just whipping up packages when you need a full dependency tree involving libraries that conflict with base distro versions... well good luck with all that.

Example of where traditional package managers fall face-flat: The ruby/node managers allow the current version to be easily managed (and version controlled) on a per-project basis via .ruby-version/.node-version files. Good luck ever getting anything like that into any distro.

> They just aren't written in hipster languages and they don't force you to compile every fucking thing you want to use on every fucking machine every fucking time you install it.

[So. Much. Anger. Really?]

ndenv can't build from source. It uses official upstream tarballs. Homebrew likewise has a build infrastructure and produces binary "bottles", used for almost all installs. So, whatever.

>Debian provides a pretty easy to follow guide about making your own unofficial backports, or guidance on creating official backports, and even has a basic 'auto' setup script and a "backport from a PPA" guide.

Which statement is willfully ignorant of the very real use cases that these 2nd tier package managers cover, such as:

* Works cross-platform (ala rbenv/ndenv). OS X, .deb-based, RPM-based, etc. All good.

* The aforementioned automatic version selection. (rbenv/ndenv)

* Supports nearly every upstream version in a consistent manner, important for long-term project consistency/stability. (rbenv/etc)

* Can't interfere with the base platform's operation. Backports done wrong can easily break stuff. These tools' strategy of never touching the QA'ed base platform is far better. (homebrew/linuxbrew)

* VASTLY easier to contribute to than any distro or even (especially) a random PPA. Pull request and done. (all)

* Obligatory pshaw re: making unofficial backports: "brew edit $FORMULA" and done. I've dealt with package systems from virtually every distro out there. None of them are lower ceremony and better suited to task than pretty much any of the 2nd level managers in their respective elements.

On a larger point of your rant, I'll agree: Linux distros and their package managers could stand to learn a lot from the cases covered by the current crop of 2nd level managers. There are great ideas that could be "upstreamed". But all of them would need significant tooling, convention, and cultural effort to make this happen. Honestly, I can't imagine ANY Linux distro embracing these needs well in practice, and many were actively hostile when approached about same. (Cf. mailing list discussions about extended ruby and python version support before/around the time rvm was created. Don't eat within an hour beforehand.)