In my latest stint as a manager from 2015–2018, I followed your principles pretty well. There was one priority around cost reduction for which I had been given guidance that it was near if not at the apex of the pyramid. I pushed back against several feature requests because they would have compromised the cost reduction priority. That pushback was a key reason I was let go from that company. Part of me feels badly that perhaps I shouldn’t have died on the hill of that top priority. Most of me feels good that I didn’t just take on the requests that would have severely degraded the team’s ability to implement a key cost-saving feature. Principles can be expensive at times.