Chatbots are the future but your points are valid. They don't provide affordances, however chatbots provide a form of progressive disclosure and direct interaction that was previously impossible.

Toolbars and menus provide affordances but you still need to know what things are called and what order to use them. "I'd like to email this file as a PDF and I'd also like to print it." may be much easier in a chat UX than in a menu based UX. Often these things can co-exist but chatUX has access to much more nuanced UI that would otherwise be too complex to build or expose.