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The author says he would like to see a feature in apt where the source code is downloaded and compiled. It already exists.
apt-get source <package> --compile
This will download the source file, and use dpkg-buildpackage to build a binary deb file. Using dpkg, you can install this deb and have dependencies resolved.
In addition, Debian has another tool in early development called auto-apt. Using auto-apt, one can try to compile a source tree and if any libraries and missing auto-apt will automatically retrieve them from your repositories. This means you can do a plain old tgz ,/configure && make && make install deal, but if you're missing any -dev packages, auto-apt will automatically grab them. Convenient, no?
Please do research. Otherwise, nice article. Although I don't know if a "lack of package management" is necessarily a "plus" of Slackware. Windows has a "lack of package management" too, but no one raves about it (at least no one I know).