[ttepasse]

There is also a lack of serendipity or explorability with voice: How do you know whats possible? There is a reason a GUI menu is called a menu. It not only gives you access to multiple options but also at a glance an overview what options are there, like a restaurant menu.

[esafak]

Discoverability is the term; e.g., "What Can I Say? Effects of Discoverability in VUIs on Task Performance and User Experience" https://dl.acm.org/doi/10.1145/3405755.3406119