You don't see what they do perhaps? A manager spend half his time interacting with stakeholders with whom developers would have longer struggles to communicate

You don't see what they do perhaps? A manager spend half his time interacting with stakeholders with whom developers would have longer struggles to communicate with. And all of that would be at best time that cannot spent making individual contribution to that web app. The other half of their time is sucked up by the paper work you would otherwise have to do; and 1on1s, which are totally useless but occasionally so useful it pays off for all the other hours spent on those. I also see managers as useless, don't worry they themselves know it too. they do all the technically menial activities, we can let them keep their dignity, continue to call them boss and spare them to enjoy their pseudo title, while all pretending we are still in the system of the 70s/80s