It’s not about what we have, it’s about what we’re building. In such a system, I see it as either more defensive, or a system with two subpar players in the team. Even if they are not subpar, they are made to be by a role that limits any particular prowess they may have - which is asking a great forward to defend too much or a great defender to attack too much.
Case in point can literally be seen on this page where a player who has been considered a failure in Antony is now suddenly seen as a viable option because the job has changed from winger to wing back. There’s a home in a team for average players with this role, certainly in a way that there isn’t if you just played with a full back and a winger.
Also, for continuity sake - it’s a weird formation and what happens if we sack this manager in a year? Do we now need to go and find another needle in a haystack 343 manager on the market? Or do we have to see these wing backs as they are neither good enough to play full back or winger for the next manager? What about our youth teams? Do we start developing wing backs now? After all, the message seemed to be about developing some sort of club ‘game model’, and as old school as it sounds - this is just not Manchester United’s, for me.