> Good PMs know how to gatekeeper from other departments and leadership, identify engineers strengths and defer to their expertise, and remember answers to the same technical questions so they can at least build upon their knowledge of the craft. I have no clue how rare they are, but those are what I try to do on a regular basis on top of disseminating information as it changes from product stakeholders to engineering.

Good PM, yes, they can. But how does that required any kind of skill than have more value than an engineer skill ? I haven't met any good PM in 7 years and 3 jobs... It's kind of sad really.