There is a section on motivation in the blog post (it literally has "Motivation" in the title):

> A number of clients already exist for the XMPP protocol, however Dino sets a different focus. Existing clients target tech-savvy power users. The XMPP ecosystem lacks a client that is enjoyable to use while providing the features people expect from a modern chat application. Dino fills that gap by aiming to be secure and privacy-friendly while at the same time providing a great user experience.