The reason it doesn't work is because it's not done properly. Levy should stick to the commercial side and let the DoF do his thing, but it doesn't happen.
The managers should get used to being head coaches. All the best run clubs in Europe have a DoF setup and I think it will continue that way. That's the reason Dortmund, RB and Monaco (under Campos) have had great success finding players with little outlay.
Always a bit of confirmation bias in those kind of examples.
Many of the biggest clubs don´t.
If you (or someone) do not like Levy one will not like the current model. I get that. But that doesn´t mean it is the fault of the structure.
Levy gets heat at soon as things go bad, but did anyone complain about the structure in 16/17? Same story at Utd. Did anyone complain when Ferguson and Wenger were working with their directors? Just as many examples of the opposite.
To me the structure isn´t necessarily bad. But regardless of structure you need good people. Is Levy good at those aspects of the game? Honestly hard to tell. Our recruitment, handling of contracts etc. I believe overall has been good, but no DoF and no club will every single year make perfect decisions on transfers etc. - again regardless of which structure you got. Baldini, Monchi etc. were supposed DoF gods, but it haven´t really worked out that way in the end...