Disagree with the GUI part. Text based configuration is stable, version-controllable, and intuitive to use. Look at Xcode for a nightmare of GUI configuration.
Currently mainstream k8s is text based, because it's still too fast moving and new. Creating a great GUI would be a serious overhead and there's not enough interest/demand for it. It'll come eventually.
OpenShift's web interface lets you do a lot (other alternatives are of course available). And it's quite nice being able to edit the YAML of everything via the web interface as well!
