For what I use Linux for, Inkscape, Blender, web browser etc. do you think they send text commands from the GUI to another UI, the CLI? Sounds like an inefficient, legacy irrelevance to the user.
Remember this a usability issue, so for non IT users, incoherent text strings or commands are indeed magic spells. Any inappropriate UI is bad usability. They have put a lot of effort into usability on Plasma. So it’s quite a shame that they got this so wrong.