> The documentation doesn't explain how to install binaries and the download pages don't either.

Hmm.

"The graphical installer for PostgreSQL includes the PostgreSQL server, pgAdmin III; a graphical tool for managing and developing your databases, and StackBuilder; a package manager that can be used to download and install additional PostgreSQL applications and drivers.

The installer is designed to be as straightforward as possible and the fastest way to get up and running with PostgreSQL on Windows." http://www.postgresql.org/download/windows/

"Binary packages for Solaris can be downloaded from the solaris subdirectory of the version you require from our file browser.

Packages for Solaris 10 and 11 are available for Sparc and i386 platforms.

Although produced by Oracle (previously Sun), these packages are not officially supported by them.

Solaris packages are installed by unpacking the compressed tar files directly into the install directory; see the README files for details." http://www.postgresql.org/download/solaris/

"These distributions all include PostgreSQL by default. To install PostgreSQL from these repositories, use the yum command:

yum install postgresql-server

Which version of PostgreSQL you get will depend on the version of the distribution: ..." http://www.postgresql.org/download/linux/redhat/

"Debian includes PostgreSQL by default. To install PostgreSQL on Debian, use the apt-get (or other apt-driving) command:
apt-get install postgresql-9.4

The repository contains many different packages including third party addons. The most common and important packages are (substitute the version number as required): ..." http://www.postgresql.org/download/linux/debian/

"Ubuntu includes PostgreSQL by default. To install PostgreSQL on Ubuntu, use the apt-get (or other apt-driving) command:
apt-get install postgresql-9.4

The repository contains many different packages including third party addons. The most common and important packages are (substitute the version number as required):" http://www.postgresql.org/download/linux/ubuntu/

"RPMs for SUSE Linux and openSUSE are available from the openSUSE Build Service in the project server:database:postgresql. Platform-specific RPM packages are available for PostgreSQL as well as a variety of related software. Use the search facility to find suitable packages. Documentation is also available there." http://www.postgresql.org/download/linux/suse/

"Note! These are the generic Linux download instructions. If you are using one of the major Linux distributions, you should read the distribution specific instructions: ... PostgreSQL is available integrated with the package management on most Linux platforms. When available, this is the recommended way to install PostgreSQL, since it provides proper integration with the operating system, including automatic patching and other management functionality.

Should packages not be available for your distribution, or there are issues with your package manager, there are graphical installers available.

Finally, most Linux systems make it easy to build from source. ... [Also, i]nstallers are available for 32 and 64-bit Linux distributions and include PostgreSQL, pgAdmin and the StackBuilder utility for installation of additional packages.

Download the installer from EnterpriseDB for all supported versions." http://www.postgresql.org/download/linux/

> The point is that every other database explains precisely the recommended approach for how to install it on every platform.

It really looks like Postgresql does that, too. Do you disagree?