Re: Management...
"Management and sales are two sides of the same valueless coin."
Management can contrive to be two sides of the same valueless coin without the assistance of sales.
I had a client where two directors had been given overlapping areas of responsibility. I can only assume that when the business was set up both had to be given titles to satisfy their egos but nobody could think of sufficiently separated roles for them. This lead to frequent shouting matches in the open office. Essentially these were territorial disputes and I think the only reason they didn't go peeing against desks & machinery to mark their territories was that they didn't think of it.
One of these disputes was how the job batching was to work on a new system. Each was insisting on their pet criteria. We ignored them and built a batching system in which every parameter we could think of could be selected and thresholds set. Neither of them could complain they hadn't got what they wanted which ended that particular dispute. We included a screen for adjusting all this in the shop floor user interface on the basis that the guys doing the work would have a better idea of what was needed in reality and installed it with some reasonable looking initial settings. I don't think it was ever touched again.