Interesting that as an example of the benefits of 'reification' the author gives the ability to copy/paste commands to execute them again.

Of course, this interaction with the command interface - that of selecting the previous command, copying it, then pasting it - is not 'reified'. It is executed through the - we may have to admit it - graphical interface through which you are interacting with the command line interface. It's not a purely textual interface, after all, since it includes graphical elements like a cursor.

As an experiment, consider that a voice assistant like Alexa or Siri is also effectively a command line interpreter, but that in those cases 'copy paste' is not available so easily. 'Siri, repeat back the last command I gave'?

So maybe the interface that is being praised here isn't the command line but rather the graphical interface in which a command-reifying interface is hosted...