That useless toolbar has been sitting there for many, many years, always stole visible space on my screens, I never ever used it, and I never ever got the idea it should get removed – until now. Actually yesterday I found out, how to remove KDE Konsole’s menu bar – I had tried to remove everything unnecessary from around Konsole’s core functionality: giving access to a shell / command line / … .
Update 2016-08-26: A couple of days with the toolbar removed, and my emacs looks as minimalistic as I want it to look. It’s a joy.