The first question to answer is why did Fragile to Agile develop its own framework rather than use an existing framework like Zachmann or TOGAF? ... Firstly, in our experience none of the existing frameworks resonate with non technology people. The general reaction of business executives to Zachmann or TOGAF is akin to “ah, that’s an IT thing; I don’t need to understand that”. This is a poor starting point for a discipline that must be engaged with the business from beginning to end to be successful.
While TOGAF (with version 9) has made some steps towards a greater business orientation, it DOES have an IT background, and will take some time to shake off that tag, if it ever does. TOGAF and other "high-ceremony" methodologies, taxonomies and frameworks also threaten a large and expensive project to implement - F2A is applicable out of the box, and can create value in a matter of weeks.