I have several friends who used to work at Valve none of them hate the place, they still have friends there, etc. But they tell similar stories as to why things that normal companies do successfully are impossible at Valve. Perhaps it’s best summed up by something one friend said about her year and a half at Valve: “I first learned who my boss was on the day she fired me.”
Google tried this, notoriously dense grating and then firing basically all the managers at an all-hands. That didn’t work out well at all... And now they have over-steered in the opposite direction!
I'm genuinely curious to hear from people who have had what they consider effective management, what did the manager do to make your work better?
You say that you've never seen anything get done faster or better as a result of something a manager did but you've probably had managers that were working preventing interference, saying no to last minute requirement changes, pushing back on deadline changes, etc.