A good project manager has to be technical enough to understand the the details, ask the right questions, and make informed decisions, but also important to be

A good project manager has to be technical enough to understand the the details, ask the right questions, and make informed decisions, but also important to be able communicate cleary with business stakeholders in a language that non-technical stakeholders understand such as cost, timelines, priorities, and risks. Engineering is an art, and a good PM can coordinate the artistry in a way that provides certainty and clarity to the stakeholders who only want to know when will the art be ready for public consumption, they don't want to know how the art is being made, but when will it be done and how much will it cost. There are many great artists but they only know how to communicate with other artists and talk about art, but when dealing with patrons you have to talk a little about art and mostly about business. When a company starts talking about hiring PMs that's a sign that the business managers feel the development work needs to be more coordinated and they need more clarity about what all these developers are working at on. If a business manager were to ask a developer what are you working on, and the answer is a deeply technical component without any clear context of how that component matters in the bigger picture of the business, then that business manager will go ask HR to hire some PMs to talk to instead.