Learn their trade, like he hasn't been in in professional football for the best part of 35 years.
As someone who has spent the best part of his life playing and coaching in Premier League, what valuable experience would he gain from managing a team he never played for or has any connection with in a league he doesn't know? By your reckoning, we might as well just appoint Micky Mellon.
Our last 8 managers going back to Howard Kendall, only 3 of them didn't start at the club they finished playing at. Walter Smith, Ronald Koeman, Carlo Ancelotti. All 3 of them took coaching roles with their respective national sides before moving into club management, and only 1 of them, Walter Smith, didn't manage a club he played for.
It's such a ridiculous point. If Real Madrid and Barcelona, arguably 2 of the biggest jobs in football, can appoint managers as former players who have Little to no experience and go on to be 2 of the most successful managers in their respective clubs history's, what makes you think Everton can't do similar (again, I might add) for their comparatively modest goals and ambitions?
It's about the character of the man as much as anything relating to experience, otherwise, Barry Fry would be held in the same esteem as the other famous Ferguson.