Facebook pushes menus over chit-chat as it updates Messengers bot features

When Facebook doubled down on its Messenger chatbot feature last year many marketers were convinced that the social network had ushered in a new era of "conversational commerce," but Mark Zuckerberg's platform appears to be dialing back a bit. 
Bots on Messenger has been updated, with Facebook announcing a rejig which pushes back on text speak within the service, instead encouraging users to interact with bots via clickable menus.
Facebook has told bot creators that the new persis