I agree in principle but Fred is often weak and easy to dribble away from while McTom, while being a big unit, isn't very good at tracking runs and has no feel for defensive positioning. Expecting them to play defensive doesn't bring out the best of them, which then hurts the team as it doesn't have a fundament to stand on.
Pressing is good but we don't know how capable we are of doing it for longer periods as well - I mean, last year we didn't manage to do it effectively under Ralf. We shouldn't just assume that ETH implements it flawlessly from one day to the other.
Maybe to emphasize the point: I don't want to paint the picture in a way that ball winning is Uniteds main issue. It is one of many, next to composure and ball retention. I am not against bringing in FDJ. But I think bringing him in will not check all the boxes.