Bundling Mono apps

Just unpacking Mono-based applications almost never works because they clutter libraries all over the place which need to be specifically installed, otherwise we get errors like

Unhandled Exception:
System.IO.FileNotFoundException: Could not load file or assembly 'log4net, Version=1.2.10.0, Culture=neutral, PublicKeyToken=a5715cc6d5c3540b' or one of its dependencies.
File name: 'log4net, Version=1.2.10.0, Culture=neutral, PublicKeyToken=a5715cc6d5c3540b'
[ERROR] FATAL UNHANDLED EXCEPTION: System.IO.FileNotFoundException: Could not load file or assembly 'log4net, Version=1.2.10.0, Culture=neutral, PublicKeyToken=a5715cc6d5c3540b' or one of its dependencies.
File name: 'log4net, Version=1.2.10.0, Culture=neutral, PublicKeyToken=a5715cc6d5c3540b'

For example, liblog4net1.2-cil_1.2.10+dfsg-6_all.deb has a nasty postinstall script that does

#!/bin/sh
set -e
# Automatically added by dh_installcligac
if [ "$1" = "configure" ] && [ -x /usr/share/cli-common/gac-package-install ]; then
	/usr/share/cli-common/gac-package-install liblog4net1.2-cil
fi
# End automatically added section
# Automatically added by dh_cligacpolicy
if [ "$1" = "configure" ] && [ -x /usr/share/cli-common/policy-install ]; then
	/usr/share/cli-common/policy-install log4net 1.2
fi
# End automatically added section

Why such things are needed is completely beyond me. Have they never heard of $PATH and /usr/lib?