Ubuntu 16.04 LTS also supports the ability to "minimize" by clicking the application Launcher icon, but it still requires the user to manually enable it.
There are two methods. You can install the Unity Tweak Tool graphical interface tool and configure it in "Unity" - "Launcher" - "Minimise", or use the following command directly in the terminal to enable it.
gsettings set org.compiz.unityshell:/org/compiz/profiles/unity/plugins/unityshell/ launcher-minimize-window true