GUIs are much more consistent across platforms than terminal features. Windows look and behave consistently but DOS vs BASH are totally different. I'm not sure

GUIs are much more consistent across platforms than terminal features. Windows look and behave consistently but DOS vs BASH are totally different. I'm not sure what you mean by efficient keyboard commands. Command line programs are extremely inconsistent with regard to command line parameters, especially across platforms. They're inconsistent between common programs in Linux and between common programs on Windows. Copying arbitrary text from a terminal is more rigid than a GUI; it's difficult to select with a keyboard, the text is unlikely to be formatted ( sometimes a good thing), and often what you want to copy isn't text but an image, sound, video clip, or some sort of object. Powerful depends on what you mean by power. There exist somewhat-interoperable terminal programs, but there are lots of GUI programs that are as interoperable or even more interoperable and both can be scripted. Often requisite functionality is only exposed with a terminal program, but that has nothing to do with the lack of power of a GUI.