So I'm with the author on the main thrust of his argument, but just to dismiss eXtreme Programming for example as a reinterpretation of the V-model, seems less than just for one of the key advancing influences for agile in the first decade of this century. Similarly Scrum comes in for some merciless treatment - many people are going hate this book on an emotional level long before they parse the content - and especially if they interpreted the title as a description of an agile method that combines elements of Scrum and Kanban. That's not what Ladas means by Scrumban. He's discussing instead what evolution of process would take place if a team was using Scrum and adopted Kanban, while relaxing Scrum's rule-immutability. His answer is that many of Scrum's practices will change and you will end up with a much leaner process, with less work-in-progress, and independent cadences for queue replenishment, improvement events and releases. In other words you end up with a typical Kanban system. Hmmm... take care what you assume is in this book when you read the title!
Any way if you can get past his style, Ladas gives us some very interesting observations on Lean software development systems. In particular I found the "feature brigade" section fascinating - a discussion of how a Kanban process for software development could be built by analogy to a fire brigade's chain of buckets. The point about such a system is that it is self-levelling, since the point at which the fireman with an empty bucket meets the one with the full bucket is variable, depending on the current rate of working of the two participants. Such self-levelling of Kanban systems, if it can be achieved with simple feedback mechanisms like this, will lead to real advantages as they are scaled.
This is an idea worth persevering with the book for!