@ChristianWS I think your idea of inconsistency differs from mine. Havin buttons on different locations in a headerbar doesnt have to be inconsistent across apps. Different layouts can be consistent.
BUT I dont talk about header bars. I do talk about CSD only and they can be whatever a guideline makes them to be. All Qt apps already have a CSD, but they suck and it would be nice if app devs would be allowed to make use of them on the KDE side if they decide that it benefits the app.