Programmer Humor

which literally everyone can easily do themselves

Key word here is 'can'. People can update it themselves, but unless kept accountable for missing something bad, they don't do it unless a PM drags it out of them. In a perfect world we'd all show enough accountability to share the info that could affect a project in a democratic and orderly way, but even when ignoring a lack of PM experience, people usually feel it's bureaucratic and takes precious time away from their specialisation.

A PM with a good background will definitely have a chance to be better than a PM without, but being able to contact the right specialists at the right time and keeping the project flowing is what truly matters.