There was a time when United were the gold standard of how clubs should be run. Juventus used Lippi's connections with Sir Alex to learn and pretty much copy our administration. That turned them into the Serie A financial juggernaut they are today. Inter used to hire our own people (Bolingbloke) and the term manager alla Ferguson (manager Ferguson's like) is still used to the very day. However it rested heavily on Sir Alex Ferguson to champion the football side of things. His influence and his record made him virtually untouchable, certainly from the bankers. He came from an era when the manager did everything himself (DOF, head of scouts, head of recruitment, Clough served as the club bus driver in some occasion etc). He also grew with the club so he knew it inside out. There isn't one square CM at OT or Carrington that Sir Alex didn't knew about.
No manager on earth will ever be able to do that simply because no manager on earth has SAF's influence + his exposure. Top managers are raised having DOFs, Football CEOs and data analysts helping them. They are totally unprepared to face a football environment without such people to rely on. It's like giving a navy seal a Sarissa and demand from him to fight in phalanx formation minutes before facing a charge. He'll die simply because he never fought in that way and there's little time for him to learn how to do it. Its time we learn from others JUST as others had previously learnt from us. There's no shame in that. Sacchi's system was heavily influenced by Cruyff, LVG' system was influenced by Sacchi, Guardiola's system was heavily influenced by LVG and so on. It's how football work. Actually its how the world works as a whole. We build upon the success of others.