I didn't attempt to make a detailed criticism. Basically, it's the naive application of Goldratt's "The Goal" to IT. People have been trying to model IT processes on manufacturing for decades. Still doesn't work. The opinion of several engineers that I respect very highly who suffered from the author's consulting services makes me discount his work entirely.

If you read farther in Goldratt, the sequels to "The Goal", he refines the notion of constraints in very interesting ways that leave the factory floor. I don't think the author of the Phoenix Project ever got that.