I think this makes total sense: Bot engines (i.e., GUIs where you devise complex conversation scenarios) don't really work beyond the quick proof-of-concept project. Their quality tend to actually decrease with the amount of effort you put into training and designing the conversations.

The underlying NLP tasks however are crucial. What Wit is doing here is build on their strength on NLP tasks on a message level, and leave the conversation rules to the developer to code as they see fit.