GUIs won over console workflows because GUIs have better discoverability and the "recall vs recognize" difference; it's mentally much easier to recognize the option you want when presented it than to recall the existence or the naming of that option.

In those aspects of UX, voice interfaces have the same drawbacks as console apps when compared to a good GUI.

Also, they have to work within the "bandwidth bottleneck" of audio - just imagine a phone system that tells you all the options you have, "Press 1 for something, Press 2 for another thing..." - they are so annoying because they are slow and inherently linear; a GUI can show the same options all at once, and you can read it much faster than listen to them.

So NLP as such is not dramatically more user-friendly unless it is at the "do what I mean" level which likely requries full human-level general artificial intelligence; before that it's just a voice equivalent of a console app, sharing all the problems of discoverability and needing to remember what the system can do and how should it be invoked.