You perhaps overlook a few things: (1) Managers are people too. They make mistakes. They should be able to recognize and correct them as others. Ideally quickly, transparently and with the insights of others. (2) Needs evolve. The right process for proof of concept R&D is not the right process for global domination with a mature product. (3) Management is about competing concerns. Often a decision must be made within a limited sphere of experience, time and resources and reviewed in the future. There is no 'right' decision, and it can be fiendishly difficult to quantify decision quality in many such circumstances without the benefit of hindsight. (4) Different people can respond very differently to the same management, so 'bad management' is perhaps too uni-dimensional a notion to hold much meaning.
In this case all I was referencing was that frequent process changes and repeated failures of process are typically an indication that a change needs to happen in management not process. No where did I state management be eliminated altogether. I stated that better managers need to be brought in to replace those that are underperforming.
Almost all processes work well enough. And there is nothing wrong with trying to find an optimum one. But process is not the solution. Quality management talent is.