Agree that the tactical part of managing is very overrated. Players make the difference most of the time not managers. That goes for any sport in my opinion.
Most people think football coaches have greatest impact of any sport. Yet no one has ever coached 2 different organizations to a Super Bowl. That covers something like almost 70 seasons last I checked of different coaches like Parcells and others trying. That's a Cubs like streak with people who have won it all before.
At the end of the day talent usually wins or loses.