On: Elementary OS Loki 0.4 Stable Release

[Bellyache5]

There's no minimize button in app windows' title bars, but you can minimize an app by clicking its icon in the dock.

[blacksmith_tb → Bellyache5]

Of course, it proves the overall point, but turning on the minimize button is just a pref, exposed by GNOME-tweak-tool [1]

1: https://askubuntu.com/questions/125765/how-do-i-add-minimize...