Hoop Blah Managers also make plenty of mistakes too. They get too reliant and attached on their 'favourite' players and ways of doing things.
To think they don't get it wrong or that things couldn't be improved upon is a slightly warped view of things.
When have I ever said they don't get it wrong?
They are just a lot more professional, more aware, more considered, less knee-jerk than YOU and every other fan.
After all, at the end they are betting their livelihood.