To begin with, I think creating a general knowledge bot that can talk about everything is an interesting research concept but not a very useful one.

Then Xatkit aims to be a very flexible platform that helps you create chatbots on top of any platform you need, more than a concrete solution for a specific set of technologies. For instance, most current solutions are tied to a specific NLU Engine (being DialogFlow, IBM Watson or whatever). Xatkit tries to abstract from the concrete engine and let you define the bot in a more abstract way and deploy the bot on any of them based on your deployment preferences.

(this doesn't mean Xatkit provides right now all the connectors you may want, it just means that the architecture of Xatkit was especially designed with this goal in mind, it's open source so it's possible for you to create whatever you need)