It would be nice to have a Baldini type subordinate to Poch. The reality is that juggling 4 competitions, everything that goes into training, fitness, player selection, asking a manager to also handle heavy lifting in regards to player recruitment is probably a bit much.
Ostensibly, this is (one of) Levy's role(s). But Levy is also charged with the stadium, commercial deals, real estate development of the club's company, etc. etc. etc.
So the manager has too much on, and Levy has too much on. Well, the head of scouting is the logical man to be in charge of finding players that meet Poch's needs and Levy's budget, of course. Well Steve Hitchen/Paul Mitchell/David Pleat types may know footballers when they see them...but they don't have the contacts list and relationships with the movers and shakers in the game like the Baldini's of the world do.
I absolutely think there's a place in the club for this role. The trouble in filling it being that most who are proven at it will balk to having to be subordinate to Poch's choosing and Levy's financing, and anyone without a track record who is successful will soon find himself lured by more control.
Ideally things would work as such: Levy tells Poch and DoF that we have £40M to spend plus sales. Poch tells Steve Hitchen he needs a first choice MF and a first choice RB, plus cover at CF and CB. DoF says that he can get offload Janssen and Llorente for (make believe) £15M and will get £25M for Toby, setting a budget of £80M. Scouting submits their list of players fitting Poch's asks, and Poch and DoF set about spending the £80M in the most productive way possible according to Poch. At some point the DoF is alerted by an agent that a player like Isco could be had - but its outside the budget.
First he determines if Poch even wants the player, and if he does, they together go hat in hand to Levy who will determine if the club can afford it.
Realistically, this is how every stable and successful business is run. The idea that a manager, or DoF, or Chairman can fill all the duties necessary is pretty absurd.